J. D. Hood.
Tylothrips bruesi, a New Thysanopteron from Florida.
Psyche 62:35-38, 1955.

Full text (searchable PDF, 300K)
Durable link: http://psyche.entclub.org/62/62-035.html

The following unprocessed text is extracted from the PDF file, and is likely to be both incomplete and full of errors. Please consult the PDF file for the complete article.

TYLOTHRIPS BRUESZ,
A NEW THYSANOPTERON FROM FLORIDA
Cornell University
The following species was taken within a few miles of Professor Charles T. Brues' home on the St. Johns River, in Florida, sh,ortly after we had collected together and renewed an acquaintance which apparently began very nearly fifty years ago, long before he became Professor of Entomology at Harvard University and Editor of Psyche.
Tylothrips bruesi, sp. nov.
Text-figures 1 to 3.
Like the Peruvian concolor Hood, the type of the genus and only known congener, in coloration and most structural features, but (1) head about 1.4 (instead of scarcely 1.2) times as long as width across eyes, (2) last two antennal segment,^ much narrowed basally, thus not forming with segment VI a terminal club, (3) segment 111 of antennae longer (instead of much shorter) than IV, and with several of its more apical setae as long as the neighboring sense- cones, (4) fore tibiae, only (instead of all three pairs), tuberculate along inner surface, (5) tube fully 2.3 (instead of less than twice) as long as its greatest subbasal width, and (6) major setae dull, or blunt, or very slightly dilated at tip
(rather than broadly expanded).
$ (macropterous) . - Color of entire body, legs, and antennae blackish brown, with pedicel of antennal seg- ment 111 and tip of tube somewhat paler and yellowish, IV-VI narrowly whitish just beyond the dark extreme base; internal pigmentation bright crimson-red, abundant in thorax and abdomen (exclusive of tube), sparse in head and first antennal segment; fore wings brown, darkest in anal area and with a dark median streak, which is nar- rowly edged with paler, extending to tip, the posterior margin pale between anal area and first fringing hair; Pu&e 62:35-18 (1955). hup Ytpsychu einclub org/62/62-015 html



================================================================================

36 Psyche [March
major setae pale and yellowish, excepting the wing-retain- ing setae and the terminal ones, which are brown. Tylothrips bruesi, sp. nov., 9 , holotype. Fig. 1.-Head and pro- thorax, x 176. (All setae omitted from femora, antenna1 segments, and outer surfaces of tibiae and tarsi; sculpture largely omitted; slight in- accuracies are to be expected in such details as the outlines of ocelli and of inner margins of eyes, because of the opacity of the specimen. It will be noted that the type lacks the right epimeral and left coxal setae.)
Fig. 2.-Segments 111-v, left
antenna, x 236 (all setae shown).
Fig. 3. -Segments VI-VIII, right antenna, x 236 (all setae omitted). The cost of the line engraving was borne by Cornell University through its Committee on Faculty Research Grants.



================================================================================

19551 Hood - Tyiothrips bruesi 37
Head (Fig. 1) slightly produced between eyes and an- tennae, fully 1.4 times as long as greatest width across eyes, this width somewhat greater than that across cheeks slightly behind eyes; sides of head incised at posterior margin of eyes; cheeks rounded and converging to near base, where the least width is about 0.86 the width across eyes, serrate as seen from above because of rather heavy anastomosing lines; frontal costa with a shallow rounded groove ; postocular setae approximately 45 microns long, 121 microns apart, slightly dilated at tip. Eyes prominent, large, protruding, slightly less than one-half the length of head, their dorsal length 106 microns. Median oceilus with front margin on line with that of eyes. Antennae long and slender, about 2.24 times the length of head, their last three segments (Fig. 3) not at all united, the pedicels of VII and VIII not broad; 111 somewhat longer than either IV or v (Fig. 2) , with several very fine, indistinct, transverse lines of sculpture on pedicel ; major sense-cones long and slender, disposed as follows on inner (and outer) surfaces of seg- ments : 111 1(2), IV 1 (2) , v 1(1), VI 1 (I), VII 1 dorsal ; 111 and IV with several additional minor sense-cones; major antenna1 setae long and pointed, those associated with the major sense-cones about equal to them in length. Mouth- cone short, nearly semicircularly rounded at tip, extending about 70 microns beyond posterior dorsal margin of head. Prothorax (Fig. I), along median line of pronotum, about 0.63 the length of head and one-half the width across fore coxae, its surface nearly smooth but with a few faint lines of sculpture near posterior margin ; posterior half of epimera fused with pronotum ; antero-marginal setae very minute, the other usual setae long, moderately heavy, and very slightly widened at tip, the antero-angulars and midlaterals about 73 microns, epimerals and postero-mar- ginals 87-91, coxals about 33. Pterothorax rather long, wider than prothorax across coxae; metanotal plate in basal half, shield-shaped and roundly elevated, its posterior part without distinct foveae at sides, the single pair of major setae pointed, 43 microns long and 78 microns apart. Legs moderately long and slender, the fore tibiae (Fig. 1) with several strong tubercles from each of which arises a



================================================================================

38 Psyche
[March
long pointed seta, mid and hind tibiae without much tuber- cl'es; fore tarsi with a strong and somewhat recurved tooth on inner surface. Fore wings straight, narrowed slightly and evenly to tip, not closely fringed, without ac- cessory setae on posterior margin, the subbasal setae blunt (asymmetrically disposed in type).
Abdomen without distinct sculpture; major setae mostly slightly broadened at tip (excepting the wing-retaining ones, seta 111 on IX, and the terminal ones, all of which are pointed), I on IX 103 microns, 11 132, 111 109, terminal 120; tube (x, only) about 0.7 the length of head and fully 2,3 times as long as greatest subbasal width, its sides slightly concave beyond base, then straightly converging to tip. Measurements of 9 (holotype), in mm. : Length about 1.9 (fully distended, 2.43) ; head, total length 0.258, width across eyes 0.182, least width behind eyes 0.164, greatest width across cheeks 0.179, least width near base 0.158, width in front of eyes 0.093; pronotum, median length 0.154; prothorax, width across fore coxae 0.304; meso- thorax, width across anterior angles 0.305; metathmorax, greatest width 0.325; fore wings, length 0.962, width at middle 0.061 ; abdomen, greatest widtlh (at segment IV) 0.354; tube (segment X, only), length 0.178, greatest subbasal width 0.077, width at apex 0.041. Antenna1 segments : I 11 111 IV v VI VII VIII Width (microns): 44 30 36 36 32 27 25 17 Total length of antennae, 0.578 mm.
FLORIDA : Welaka (Conservation Reserve, University of Florida), August 12, 1954, J. D. H., 1 9 (holotype), from dead fallen branches of Turkey Oak (Quercus laevis), in open sandy woods.
This is th'e second species of the genus Tyiothrips, which the writer erected in 1937 for a Peruvian species that came from dead branches and leaves. The two are almost identical in color and general appearance and could easily he confused with each other.




================================================================================