J. D. Hood.
New Neotropical Thysanoptera Collected by C. B. Williams.
Psyche 32:48-69, 1925.

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48 Psyche [February
NEW NEOTROPICAL THYSANOPTERA COLLECTED BY C. B. WILLIAMS.
BY J. DOUGLAS HOOD,
University of Rochester.
The present paper brings forward several new genera and a number of new species collected by Mr. C. B. Williams during his residence in Trinidad from 1916 to 1919 and also during a short trip to the Lesser Antilles in March and April 1915. It was originally intended by Mr. Williams that the material be worked up by us jointly; but my own delay in getting at the task until he had been appointed to the distant post of Ento- mologist to the Egyptian Ministry of Agriculture has made such co-operative work seem inadvisable. During his various visits to the United States the systematic position of many of the genera and species was worked out by Mr. Williams and ten- tative manuscript names assigned. These names have been retained except in the case of several of the more interesting and conspicuous forms which, I think, are better named after their collector in recognition of his exceedingly valuable work on this group of insects.
The following descriptions are preliminary to other papers in press or in preparation, and are published at this time in order that the worth of this splendid collection-certainly the largest ever brought out of tropical America-may not be lessened by the otherwise inevitable loss of priority in many of the names. The holotypes, allotypes, and a portion of the paratypes have most generously been placed by Mr. Williams in my col- lection.
Stomatothrips septenarius sp. nov.
Female (macropterous).-Length about 1.4 mm. Color testaceous, with head, prothorax, two pterothoracic transverse bands (one near middle and one at base), abdominal segments 3-9, all tibiae and tarsi, and antennal segments 4-9, blackish brown; antennal segments 1-3 yellowish white, 4 paler basally; fore wings pale gray-brown, with two white cross bands, one narrow and at basal sixth, the other wider and at apical seventh, Pu&e 32:48-69 (1925). hup Ytpsychu einclub orgt12/32-04a html



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19251 New Neotropical Thysanoptera 49
intermediate brown area somewhat paler at middle; hind wings light gray with two pale bands corresponding in position with those on fore wings.
Maxillary palpi seven-segmented, the basal segment large; labial palpi five-segmented, the basal segment short. Fore wings somewhat expanded apically, broadest at apical sixth, where they are about 1.6 times as wide as at basal fourth.
Trinidad and St. Thomas; C. B. Williams; taken by sweep- ing.
The seven-segmented maxillary palpi, the dark brown fourth antennal segment and the narrower fore wings distinguish this species at once from S. flavus Hood, the type of the genus, to which it bears a close superficial resemblance. Frankliniella parvula sp. nov.
Female (macropterous) .-Length about 1.1 mm. Color light brown, apex of abdomen darkest; femora usually brown, much paler at apex, tibiae and tarsi pale yellowish gray; antennae with segments
1, 2 and 4-8 brown, 2 darkest, 3 light yellowish gray, 4 and 5 paler basally; wings pale brownish, narrowly lighter along median line; ocellar pigment dull orange. Head about 1.33 times as wide as long. Segment 2 of antennae slightly thickened on dorsum at apex and bearing 2 rather prominent dark bristles; length of antennal segments in microns: 1, 24; 2, 36; 3, 75; 4, 51; 5, 39; 6, 53; 7, 10; 8, 17. Male (macropterous) .-Pale yellow, with a gray-brown blotch at middle of abdominal tergites 2-8; wings almost clear; antennae nearly white, segments 4 and 5 tipped with gray, 6-8 gray.
Trinidad, Grenada, Panama, and Costa Rica; C. B. Wil- liams; on cacao, in various flowers, etc. Easily recognized by the long third antennal segment. The prolongation of the second segment can be seen to advantage only when viewed from the side.




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Psyche
Frankliniella nigricauda sp. nov.
Female (macropterous).-Length about 1.4 mm. Color bright orange-yellow, head paler, abdomen shading from yellow ,
at base to dark blackish brown or black in apical segments. Trinidad; C. B. Williams; swept.
The coloration is unique in the genus.
Anaphothrips bicinctus sp. nov.
Female (macropterous) .-Length about 1.0 mm. Color dark brown (tip of abdomen darkest), with prothorax, ab- dominal segments 3-6, legs and segments 3 and 4 of antennae, abruptly pale yellow; segment 5 of antenna gray, 6-8 dark brown; wings light gray, with a dark, brownish band across fore wings from basal fifth to near middle. Trinidad; C. B. Williams; swept.
Very close to A. alternans (Bagnall), but separable by the smaller size and the coloration of the abdomen. Astrothrips angulatus sp. nov.
Female (macropterous) .-Length about 1.0 mm. Dorsal surface deeply reticulate.
Color yellowish brown, with base of
abdomen and sides of pterothorax darker; abdominal segments 8 and 9 with a distal gray band; antennae yellow, with segments 1 and 2 darker and apices of segments 4, 5 and 6, and all of seg- ment 7, brownish; fore legs yellow, the femora and tibiae brown- ish at sides, especially near middle; middle and hind femora and middle tibiae brown, yellow at either end; middle and hind tarsi and hind tibiae yellow, the last clouded with brown in apical third; fore wings brown, with three transverse, narrow, white bands, situated at basal fifth, apical two-fifths, and ex- treme apex, respectively. Vertex slightly elevated but not at all produced or overhanging. Antennae seven-segmented; seg- ment 1 short, subcylindrical, about as broad as long; 2 the broadest in entire antenna, goblet-shaped, pedicellate; 3 slender, vasiform, pedicellate, about four times as long as wide; 4 about



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19251 New Neotropical Thysanoptera 51
0.8 as long as 3 and somewhat stouter; 5 about 0.7 as long as 4 and of the same width, oval, pedicellate; 6 equal in length to 5 but more slender, of the same form but inverted, the pedicel being apical and delimited by an oblique transverse line; 7 shorter, very slender; sense cones simple. Prot,horax three- fourths as long as head.
Abdomen strongly and sharply cons-
tricted beyond base of segment 2, which is the longest in entire abdomen; 10 tubular, about 0.7 as wide at base as long, divided above by a longitudinal suture.
Grenada, Guadeloupe and Trinidad; C. B. Williams; on cacao, an unidentified creeper and fustic (Chlorophora tinctoria). Readily known by the seven-segmented antennae with simple sense cones, the non-produced vertex, and the short prothorax, which is angulate at the sides. Astrothrips constrictus sp. nov
Female (macropterous) .-Length about 1.1 mm. Dorsal surface deeply reticulate. Color yellowish brown, paler at middle of pterothorax and in last three abdominal segments; segment 10 of abdomen nearly black in apical third; antennae yellow, with segments 1 and 2 darkened with brown, and apical three-fifths of segment 5 and all of segment 6 unevenly darkened with blackish brown; femora brown; tibiae brown, narrowly yellow at either end; tarsi yellow; fore wings brown at base (scale darker) and with brown blotches of varying lengths scat- tered along veins, these blotches forming more or less distinct transverse bands at basal third and apical fourth; ring vein at extreme tip of wing dark brown.
Vertex produced, overhanging
the insertion of antennae. Antennae six-segmented; segment 1 short, subcylindrical, about as broad as long; 2 broadest in entire antenna, goblet-shaped, pedicellate; 3 slender, vasiform, pedicellate, fully five times as long as wide; 4 somewhat more than half as long as 3 and slightly stouter, subfusiform, pedi- cellate, with an oblique, transverse line beyond middle; 6 about one-third as long as 5, slender; sense cones slender, those on segments 3 and 4 bifurcate beyond base. Abdomen strongly and sharply constricted beyond base of segment 2, which is the



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52 Psyche [~ebruar~
longest in the entire abdomen; 10 strongly constricted at basal fourth, widened beyond, and narrowed again at apex, divided above by a longitudinal suture.
Trinidad; C. B. Williams; on Lantana sp. Recognizable at once by the basal constrict'ion of the tenth abdominal segment and the six-segmented antennae with their Y-shaped sense cones.
Coremothrips gen. nov.
(KopePa, a broom; Qpqb, a wood wor-in.)
Body and all appendages very slender, and all bristles of monstrous size, hooked and pinnatifid apically. Head with two pairs of such bristles, one interocellar and the other postocellar; prothorax with two at each of its four angles. Wings very narrow; median vein of fore wing fused with costa, the strengthened anterior margin armed with about fifteen of the usual tremendous bristles disposed in two series, one inclined forward and the other backward; fringing hairs weak and sparse. Segment 9 of abdomen with two pairs of enlarged bristles, segment 10 with one pair.
Genotype : Coremothrips pallidus sp. nov. A striking genus, of undoubted affinities with Scolothrips, but far more extreme than even that bizarre form in the de- velopment of the bristles of the body and fore wings. Coremothrips pallidus sp. nov. .
Female (macropterous) .-Length about 0.9 mm. Color uniform, pale yellowish white.
Trinidad, Panama, and St. Vincent; C. B. Williams; on leaves of cacao and avocado pear.
Plesiothrips octarthrus sp. nov.
Female (macropterous).-Length about 0.9 mni. Head, prothorax and abdomen brown, the latter darker posteriorly; pterothorax pale brownish yellow; legs pale yellow; antennae



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19251 New Neotropical Thysanoptera 53
uniform dark brown, somewhat darker than head, except seg- ment 3 which is pale brown, wit'h pedicel and apex pale gray; wings brown, the fore pair without pale band at base, but with an indistinct, narrow, median, pale streak. Antennae 8-seg- mented; segment 3 decidedly less than twice as long as wide. Segment 10 of abdomen divided above.
Trinidad; C. B. Williams; no further data. An undoubted Plesiothrips, remarkable for the distinctly eight-segmented antennae.
Plesiothrips amblycauda sp. nov.
Female (macropterous) .-Length about 1.1 nini. Color brown, head darkest, prothorax with bright crimson subhypo- dermal pigmentation; femora brown, the fore pair yellow at apex; tibiae gray, fading to pale yellow apically; tarsi pale yellow; antennae dark brown, about concolorous with head, except segment 3, which has the pedicel and apex pale gray; wings dark brown, without pale band at base. Segment 3 of antennae more than twice as long as wide. Segment 10 of ab-
domen not divided above.
Ovipositor extremely minute, ves-
tigial, entirely functionless; tip of abdomen rounded, rather t,han conical.
Trinidad; C. B. Williams; on leaf of Arum lily. The long third antenna1 segment and the undivided tenth abdominal segment, together with the dark coloration, make this a very distinct species. It is a true Plesiothrips, with an- tennae presumably seven-segmented, though the extreme t,ips of both are missing in the unique type.
Merothrips cognatus sp. nov.
Female (macropterous) .-Length about 1.0 mm. Very close indeed to M. fusciceps Hood and Williams, but with head smaller (width 0.105 mm.) and eyes larger, these prolonged on ventral surface to a point directly beneath posterior dorsal . margin of head, and about eqml in widtlh t,o their interval; tooth on fore tibia minute.




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54 Psyche [February
Antenna1 segments: 1 2
3 4 5
6
7 8
Length (P) 18 33
36 32 20
25 27 33
Width (/A) 29
27 22
23 17
17 16
13
Trinidad; C. B. Williams; on dead branch of Lagerstrcemia infested with bromeliads.
This species is separable from williamsi Priesner, described from Paraguay, by the much shorter and stouter antenna1 segments, particularly the fourth, which in williamsi is nearly twice as long as wide.
Adraneothrips gen. nov.
(aspavw, feeble; (W', a wood worm.)
Allied to Haplothrips, but wings narrowed and parallel-sided beyond base, not constricted at middle, sparsely fringed. Body weakly chitinized. Eyes often prolonged on ventral surface of head. Terminal segment of antenna long and slender, not closely united to 7.
Genotype: Haplothrips (?) tibialis Hood. The species des-
cribed by Hood and Williams as Haplothrips (?) bellus also belongs here, together with the five new species described below. Adraneothrips simulator sp. nov.
Female (macropterous) .-Length about 1.1 mm. Bicolo- rous; thorax and all of abdomen except tube pale yellow, with a band of bright crimson subhypodermal pigmentation along each side, broadest in pterothorax and abdominal segments 4 and 5; head and tube light brown, segments 8 and 9 of abdomen lightly shaded with brown; antennee with most of segment 3 and base of 4 pale; tibias pale yellow or grayish white; femora shaded with brown. Eyes prolonged on ventral surface of head beyond their posterior dorsal margins; anterior marginal bristles of prothorax long and knobbed.
Male (macropterous) .-Smaller and more slender than female.




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19251 New Neotropicab Thysanoptera 55
Trinidad; C. B. Williams; "along midrib on under surface of leaves of undet,ermined plant."
Like A. alternatus in color, but with the eyes distinctly prolonged on ventral surface of head.
Adraneothrips abdominalis sp. nov.
Female (macropterous) .-Length about 1.1 mm. Bico- lorous; head, thorax, and abdominal segments 1 and 7-10 brown, head darkest, no subhypodermal pigmentation; antennae with most of segment 3 and bases of 4-6 pale; segments 2-6 of abdomen pale yellow, or 6 lightly brownish; tibiae pale yel- low or grayish white; femora not, or only slightly, darker. Eyes prolonged on ventral surface of head beyond their posterior dorsal margins. Anterior marginal bristles of prothorax long and knobbed.
St. Thomas, West Indies; C. B. Williams; grass. Easily separable by the abdominal coloration and prolonged eyes.
Adraneothrips alternatus sp. nov.
Female (macropterous) .-Lengt,h about 1.1 mm. Bico- lorous; head, pterothorax and abdominal segments 4 and 5 and 8-10 light brown, much darker t,han intervening portions and with bright crimson subhypodermal pigmentation ; prothorax pale yellow, witah a narrow band of crimson pigmentation along sides; legs pale; antennae with bases of segments 3-6 pale. Head 1.1 times as long as wide; eyes not prolonged on ventral surface of head, about equal in width t.o their interval and nearly as long as their distance from posterior margin of head. Male (macropterous) .-Smaller and more slender than female, and usually paler in coloration; segment 8 of abdomen usually much paler than 9, often concolorous with paler portions of abdomen.
Trinidad and Panama; C. B. Williams; common on dead banana leaves, on upper side along midrib.



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Psyche [February
Adraneothrips f uscicollis sp. nov.
Female (macropterous) .-Length about 1.1 nim. Bico- locous; head, prothorax, pterothorax and abdominal segments 4 and 5 and 8-10 brown, much darker than the intervening portions and with bright crimson subhypodermal pigmentation; legs pale; antennae with most of segment 3 and bases of 4-6 pale. Head nearly as wide as long; eyes not prolonged on ventral surface of head, three-fourths as long as their distance from posterior margin of head, about two-thirds as wide as their interval.
St. Lucia, British West Indies; C. B. Williams; from mis- cellaneous bushes.
Adraneothrips uniformis sp. nov.
Female (macr~pt~erous) .-Length about 1.1 nim. Uni- colorous; pale brown, with bright crinison subhypodernial pig- mentation at front and along sides of head, throughout thorax, along sides of abdomen, and in last two abdominal segments; antennae nearly uniform brown, segment 3 paler basally; legs brown, with trochanters, tarsi, and both ends of all tibiae, pale. Head 1.09 times as long as wide; eyes not prolonged on ventral surfaceof head, about equal in width to their interval and only slightly more than one half as long as their distance from posterior margin of head.
Trinidad; C. B. Williams; on dead banana leaves with A. alternatus.
Zygothrips speciosus sp. nov.
' Male (macropterous) .-Length about 1.0 mm. Color dark brown, with abdominal segments 1-6, all tibiae and tarsi, and antenna1 segments 3-5, clear pale yellow, almost white; segment 2 of antennae pale apically, 6 pale in basal half; wings nearly colorless. Postocular bristles nearly pointed. Prothorax with distinct bristles at posterior angles only, outer pair broadly dilated at tip, inner pair nearly pointed.




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19251 New Neotropical Thysanoptera 57
St. Croix, Dutch (now American) West Indies; C. B. Wil- liams; from grass,
The only species of the genus so colored. Hindsiana rhopalocera sp. nov.
Female (macropterous) .-Length about 1 .I mm. Color yellow; head decidedly darkened with brown, particularly an- teriorly; prothorax and sides of pterothorax lightly brownish; abdomen shading to pale grayish brown in segments 8 and 9; tube nearly black except for a narrow, pale, brown band at base and one of equal width at apex; legs uniform pale yellow; antennae yellow in segments 1-3, uniform dark blackish brown beyond, segment 1 shaded with brownish basally; wings faintly yellowish at base, nearly clear beyond. Head about 1.3 times as long as wide, cheeks parallel; eyes less than one-fourth as long as head, about two-thirds as wide as their interval; postocular bristles long, broadly dilated apically; antennae with segments 7 and 8 compactly united to form a heavy club which is twice the length of segment 6, segment 8 less than half as long as 7, which is distinctly the longest in entire antenna. Prothorax with all bristles present, subequal to or shorter than postoculars and similarly dilat(ed; median thickening distinct. Wings of fore pair without accessory hairs; outer subbasal bristle short and pointed, others dilated, about as long as those at anterior angles of prothorax. Tube about 0.6 as long as head, less than twice as long as basal width, which is less than twice the apical; sides somewhat concave; terminal bristles more than twice the length of tube.
Guadeloupe, French West Indies; C. B. Williams; from an undetermined plant.
The structure of the last two antenna1 segments distinguish this species from its congeners.
Trichothrips calcaratus sp. nov.
Female (apterous) .-Length about 2.3 mm. Color brownish yellow, with prothorax, pterothorax and basal three-fourths of



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58 Psyche [~ebruar~
tube darkened with brown; extreme tip of tube light gray; abdominal segments 3-8 with a dark brown transverse band on upper surface near base; antenna1 segments 1 and 2, and basal half of segment 3, yellow and concolorous with head, remainder of antenna dark blackish brown except for the yellowish pedicels of segments 4 and 5; hypodermal pigmentation orange, opaque. Head with two, more or less evident, setose lateral tubercles just behind eyes. Fore tibia produced at lower, inner surface of apex to form a flattened, obtuse spur which is about one-third as long as width of tibia; fore tarsus with a large, straight, acute tooth. Tube 0.75 as long as head.
Male (apterous).-Much like female, but with the two lateral tubercles just behind eyes well-developed and usually very prominent. Fore tibia with an acute, additional projection on inner surface of apex, directly above the flattened, obtuse spur; fore tarsus with the tooth longer than width of tarsus. Trinidad; C. B. Williams; from dead branch of Lagers- troenzia infested with Bromeliads, and from bamboo. The form of the head is suggestive of T. flavicauda Morgan. It is the only species of the genus with strongly armed fore tibiae. Eurythrips collaris sp. nov.
Male (macropterous) .-Length about 1 .1 mm. Color blackish brown with purple subhypodermal pigmentation; legs paler, mid and hind tibiae and all tarsi, pale yellow, fore tibiae shaded with brown. Antennae with basal half of segment 3, basal third of 4, and basal fourth of 5 pale yellow. Vertex
sharply conical. Antennae long and slender, all segments elon- gated. Mouth cone long, fully attaining posterior margin of prosternum. Bristles long, knobbed; prothorax with anterior angulars wanting, all others present, anterior marginals shortest. Fore tarsus unarmed.
Wings slender, sparsely fringed, 2 or 3
accessory bristles. Tube very much shorter than head. Trinidad; C. B. Williams; from dead tree in forest. The only species of the genus without long bristles at the anterior angles of the prothorax.




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New Neotropical Thysanoptera
Eurythrips gracilicornis sp. nov.
Female (macropterous) .-Length about 1.1 mm. General color yellow, with pterothorax and tube dark brown; head brownish yellow, shading to dark brown at sides; legs nearly uniform yellow, femora lightly shaded with brown; abdomen brownish at sides and apically; antennae brown (excepting segment 3 which is clear yellow), segments 1 and 2 darkest. 1 paler at base, 2 paler at apex, 4-6 paler at base and apex. All segments of antennae, excepting 1 and 2, very long and slender for the genus, 4 and 5 three times as long as wide. Mouth cone very short, broadly rounded, hardly attaining middle of pros- ternum. Bristles long and dilated at apex; prothorax with anterior angulars well developed and anterior marginals wanting. Fore tarsus with a long, hooked tooth. Wings brown, fore pair without accessory bristles. Tube very much shorter than head. Trinidad; C. B. Williams; swept.
Distinguishable by the short mout]h cone and tube, and the slender antennse.
Lissothrips breviceps sp. nov.
Female (brachyptlerous).-Length about 0.9 mm. Color dark brown with red subhypodermal pigmentation; segments