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Psyche 15:67-80, 1908.

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19081 ,
ROHWER - THE APHID GENUS FORDA
EXPLANATION OF PLATE.
Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.
Fig. 9.
Fig. 10.
Fig. 11.
Fig. 12.
Fig. 13.
Fig. 14.
Alepomyia bryanti, genitalia, 8.
Alepomyia bryanti, venation. .
Holocentropus flaws, genitalia, d'
Limnephilus moestus, genitalia, 9 .
Limnephilus pulchellus, genitalia, 3.
Polycentropus maculatus, genitalia, 3.
Isoperla ventralis, venter, ? .
Limnephilus moestus, genitalia, 8, top.
Limnephilus pulchellus, genitalia, 8, top. Limnephilus moestus, genitalia, d' .
Limnephilus moestus, genitalia, 8, top.
Halesus sparsus, genitalia, 8.
Alepomyia bryanti, genitalia, 8, top.
Anabolia quadrinotata, genitalia, 8.
THE APHID GENUS FORDA.
BY S. A. ROHWER, BOULDER, COLORADO.
LAST spring Prof. T. D. A. Cockerell sent some aphids of the genus Forda and some ants to the U. S. Nat. Mus. The ants were named Lasius subniger Emery while the aphids were supposed to be a new species. They were determined by Mr. Pergande. Mr. Pergande did not care to describe the aphids so I undertook to collect some more of them and work them out, however I was not able to find the same species, but found two others that are thought to be new to science and are herein described. There are but five representatives of this genus known from North America. One (F. kingii W. P. Ckll.) from Massachusetts, one (F. occi- dentalis Hart.) from Illinois, one (F. interjecti W. P. Ckll.) from New Mexico and the two new species from Colorado.
The work is a contribution from the laboratory of Systematic Zoology of the University of Colorado. I am greatly indebted to Prof. T. D. A. Cockerel1 for many suggestions.
The types of the new species have been sent to the U. S. Nat. Mus. The following table will separate the North American species. Second and fourth antennal joints not equal, fourth longer; antennal formula 3 (45) 21 ; color pale green, body covered with fine hair (111.) occidental& Hart. Pu&e 15:67-80 (1908). hup ttpsychu einclub org/15/15-067.htd



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68 PSYCHE [August
Second and fourth antenna1 joints equal . . 1. 1. Antennal joints one and two equal; antennal formula 35(421); color gray drab to greenish, body sparsely hairy (Mass.) . . kingiiW. P. Ckll. Antenna1 joints one and two unequal . . 2. 2.
Fifth antennal joint much shorter than the third; antennal formula 35(42)1; color olive green, legs and antennae somewhat darker (Colo.) . . olivacea n. sp.
Fifth antenna1 joint (counting spur) equal to or longer than third . . . 3. 3.
Upper surface of the body with a thin coat of white meal; color light yellow; length of antennal joints (1) 68, (2) 85, (3) 136-153, (4) 85, (5) 119 + 34 p (Colo.) . . flavula n. sp.
Upper surface of body without meal; color bright yellow; length of antennal joints (1) 45, (2) 60, (3) 120, (4) 60, (5) 114 + 24 (N. M.) interjectn. P. Ckll. FORDA FLAVULA n. sp. Q .
Length 3 mm. Body oval or slightly ovate; color light yellow, the upper surface sparsely covered with white meal; sutures inconspicu- ous; body without hair; legs and antennae brownish; head rather broad, fairly distinct from rest of body; eyes dark, small, but distinct; cauda similar to F. occi- dentalis, but with a few bristles; beak like F. occidentalis except at the apex where the dark lines divide form a V, the apex of which is towards the apex of the beak, length 50 p; spiracles distinct, light brown; antennae five-jointed; formula 53(24)1 or (53)(24)1; length of antennal joints (1) 68, (2) 85, (3) 136-153, (4) 85, (5) 119 + 34 p; measurements of middle leg; coxa 85, trochanter + femur 340, tibia 340 (or slightly more) tarsus 153, claw 51 p; middle tibiae, under high power, have four spines about 6 p long; a small sensorium at apex of fourth antennal joint and a larger one on the fifth joint at the base of the spur. Habitat.- Boulder, Colorado, May 9, '07 (S. A. Rohwer). On roots of grass
in nest of Lasius niger var. americanus Emery. FORDA OLIVACEA n. sp. Q.
Length 21-3 mm.
Body ovate to oval; head
small and not very distinct from the rest of the body; body without hairs or mealy covering; color olive green, legs and antennae somewhat darker; sutures inconspicu- ous; eyes dark, very small; cauda without bristles but with very short hair, the sides are not as straight as in F. occidentalis; beak as in F. flavula 55 p; antennae five- jointed; formula 35(42)1; length of joints (1) 68, (2) 85, (3) 204, (4) 85, (5) 102 + 17 p; measurements of middle leg: coxa 85, trochanter + femur 306, tibia 340, tarsus 119 claw 28 /I; a small sensorium at apex of fourth antennal joint, a larger on fifth a little before base of spur, between this large sensorium and base of spur are three smaller ones arranged in a quarter-circle. Habitat- Boulder, Colorado, May 9, '07 (S. A. Rohwer). On root of grass
in nest of Lasius niger var. americanus Emery. Not associated with F. flavula n. sp.




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JOHNSON - DIPTERA OF THE BAHAMAS
THE DIPTERA OF THE BAHAMAS, WITH NOTES AND DE- SCRIPTION OF ONE NEW SPECIES.
BY CHARLES W. JOHNSON.
THE following Diptera were mostly collected by Messrs. Thomas Barbour, Glover M. Allen and Owen Bryant during their trip to the Bahamas in the summer of 1904. The specimens from Mangrove Cay, Andros, were collected by Mr. Bryant, who visited the island after Messrs. Barbour and Allen had returned to the United States.
This collection probably represents but a small percentage of the actual number to be found; it is however practically our first knowledge of the dipterous fauna of these islands, as only eight species have previously been recorded. The diptera of the West Indies have been, for the most part, studied somewhat superficially, owing to the limited amount of material that has been collected. The only exception to this is the island of St. Vincent, where Mr. H. H. Smith made a very extensive col- lection, which has been studied by Professors Williston and Aldrich,l who record upwards of 350 species. The combined lists of Roeder and of Coquillett gives 193 species from Porto Rico. The writer in 1894 recorded 115 species from Ja- maica, since that time about fifty species have been added to the list. The number of species recorded from Cuba is about 250. The species previously recorded have also been included, and the following list of over ninety species represent all that are known to occur on the islands up to the present time.
PSYCHODA ALBIPUNCTATA Williston ?
One specimen, Mangrove Cay, Andros, Aug. 1. An imperfect specimen, agreeing with the description in having the hair on the thorax brown and the tibiae 1 On the Diptera of St. Vincent (West Indies). By Professor Samuel Wendel Williston. Dolichopodi- dae and Phoridae by Professor J. M. Aldrich. (Trans. Entom. Soc. London, for 1896, pp. 253-446, pis. VIII to XIV.)
2 Dipteren von der Insel Portorico, von V. von. Roder. (Entom. Zeitung zu Stettin, 1885, pp. 337- 349).
3 Report on a Collection of Dipterous Insects from Puerto Rico. By D. W. Coquillett.
(Proc. U. S.
Nat. Mus., XXII, pp. 249-270, 1900).
4List of the Diptera of Jamaica with description of new species. By Charles W. Johnson (Proc.
Acad. Nat. Sci., Phila., 1894, pp. 271-280).



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70 PSYCHE [August
and metatarsi annulated with white tomentum. It is however much smaller,
being only a trifle over a millimeter in length. Williston's species was described from Havana, Cuba.
PSYCHODA sp.
Two specimens, Nassau, June 28.
STEGOMYIA CALOPUS (Meigen).
Culex calopus Meig., Syst. Beschr., I, 3, 1818. Culex fasciatuflied., Auss. Zu. Ins. I, 8, 10, 1828 (non Fabricius 1805). Culex mosquito Desv., Mh. Soc. Hist. Nat. 111, 408, 1827. Numerous specimens, Nassau, June 28.
OCHLEROTATUS TAENIORHYNCHUS (Wiedemann) . Culex tceniorhynchus Wied., D-ipt. Exot. 43, 1820. Two specimens, Mangrove Cay, Andros, Aug. 1. JANTHINOSOMA COFFINI Dyar and Knab, J. coffini D. & K., Proc. Biol. Soc. Wash., XIX, p. 134, 1906.
Nassau, Bahamas, June 22,1903 (J. H. Coffin). JANTHINOSOMA PYGMAEA (Theobald) .
Grabhamia pygmaea Theob. Mon. Culic., 111, p. 245, 1903. Culex nanus Coq., Can. Ent., XXXV, p. 256, 1903. "We have placed the types of nanus Coquillett from Florida and a large series taken by Dr. Coffin in the Bahamas with pygmaea Theobald from Jamaica. (Dyar and Knab).
WYEOMYIA BAHAMA Dyar and Knab.
Tarpon Bay, Bahamas Island (T. H. Coffin). AEDES OBTURBATOR Dyar and Knab.
a. obturbator D. & K., Jour. N. Y. Entom. Soc., XV, p. 9, 1907. Tarpon Bay, Bahama Islands (J. H. Coffin). AEDES PLUTOCRATICUS Dyar and Knab.
"Nassau, Andros, San Salvador, Tarpon Bay, and Powell Point, Bahamas" . (J. H. Coffin).




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19081 JOHNSON - DIPTERA OF THE BAHAMAS 71 AEDES CONDOLESCENS Dyar and Knab.
"Nassau, June 24,1903, Andros, San Salvador, Powell Point and Long Island. Bahamas" (J. H. Coffin).
CERATOPOGON BAHAMENSIS n. sp.
Head black, face and mouth parts yellowish; antennae brown. Thorax with a
ground color of dark brown or black, covered with a grayish pollen, showing in certain light three indistinct stripes; pleurae reddish or dark brown, with whitish pollinose; scutellum dark yellow; metanotum black, grayish pollinose. Abdomen black, seg- ments with a narrow posterior margin of light yellow, venter yellow. Legs white, tips of the femora, tibiae and all the joints of the tarsi narrowly banded with black. Halters yellow. Wings hyaline. Length, 1 mm. Three specimens, Mangrove Cay, Andros, Aug. 1. TANYPUS sp.
One specimen, Mangrove Cay, Andros, Aug. 1. MYCETO~~HILIDAE.
, SCIARA sp.
Four specimens, Mangrove Cay, Andros, Aug. 1. STRATIOMYIDAE.
ODONTOMYIA sp. ?
A larva "found in a dry pond hole, Mangrove Cay, Andros, Aug. 4" (Owen Bryant).
TABANIDAE.
CHRYSOPIS FLAVIDUS Wiedemann.
Two specimens, Strangers Cay, July 14.
TABANUS LINEOLA Fabricius.
Thirteen specimens, Strangers Cay, July 14; Abaco, July 17. TABANUS sp.
One specimen (d'), immature, Abaco, July 17.



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PSYCHE
[August
HYPERALONIA CERBERUS (Fabricius) .
Anthrax cerberus Fabr., Ent. Syst., IV, 256, 1794. Exoprosopa serveillei Macq., Dipt. Exot., 11, pt. 1, p. 124, pi. 16, fig. 3, 1840. Hyperalonia serveillei Coq., Proc. U. S. Nat. Mus., XXII, 251, 1900; Aldrich Cat'l N. Amer. Dipt. p. 225, 1905.
One specimen, Abaco, July 7.
This species has been recorded from Nassau, and from Porto Rico by Mr. D. W. Coquillett. My Jamaica record is based on the
cerberus as figured by Macquart, not of Fabricius. The relegating of E. serveillii
to a synonym of E. cerberus, does away with a dispute as to the standing of the species, as Macquart did not describe the species, but only figured a wing, with the name on the plate and again on page 124 under - "Explication des figures" Mr. Coquillett concurs with me in the above synonymy.
EXOPROSOPA PARVA Loew .
Six specimens, Nassau, June 28; Abaco, July 6, and Strangers Cay, July 14. ANTHRAX LATERALIS Say.
Nine specimens, Nassau, June 28; Abaco, July 17; Strangers Cay, July 14, and Mangrove Cay, Abaco, Aug. 4.
ANTHRAX TRIMACULA Walker.
Four specimens Nassau, June 28; Abaco, July 6. ANTHRAX BIGRADATA Loew.
Eight specimens, Nassau, June 28, Abaco, July 6, Strangers Cay, July 14. ANTHRAX LUCIFER (Fabricius) .
Eight specimens, Nassau, June 28.
PHTHIRIA SULPHUREA Loew .
Three specimens Mangrove Cay, Andros, Aug. 1-4. GERON SENILIS (Fabricius) .
Three specimens Mangrove Cay, Andros, Aug. 1-4. PSILOCEPHALA OBSCURA Coquillett.
P. obscura Coq., Can. Ent., XXV, 229, 1893.



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19081 JOHNSON - DIPTERA OF THE BAHAMAS t o One specimen (3) Strangers Cay, July 14. This species was described from a
single female, collected by the writer at Kingston, Jamaica, April, 1891. The male
differs from the female in having the abdomen entirely whitish pollinose, with white pile; hypopygium yellow.
Length, 5 mm.
PROCTACANTHUS RUFIVENTRIS Macquart .
One specimen, Strangers Cay, July 14.
ERAX RUFITIBIA Macquart.
Three specimens, Stranger's Cay, July 14. The E. haloesus Walker from
Jamaica seems to be referable to this species. PSILOPODINUS CHRYSOPRASIUS (Walk.).
Four specimens, Nassau, June 28, Mangrove Cay, Andros, Aug. 4. PSILOPODINUS CAUDATUS (Wied.).
One specimen, Mangrove Cay, Andros, Aug. 1. CHRYSOTUS BARBATUS Loew.
Numerous specimens, Mangrove Cay, Andros, Aug. 1-4. CHRYSOTUS PICTICORNIS Loew.
Two specimens, Mangrove Cay, Andros, Aug . 1. CHRYSOTUS OBLIQUUS Loew ?
One specimen, Mangrove Cay, Andros, Aug. 1. DRAPETIS FLAVIDA Williston.
Three specimens, Mangrove Cay, Andros, Aug. 4. APHIOCHAETA SCALARIS (Loew).
S our specimens, Nassau, June 28.




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[August
PIPUNCULUS SUBVIRESCENS Loew. ,
Eleven specimens, Nassau June 28, Andros, Aug. 1. MESOGRAMMA ARCIFERA (Loew) .
Two specimens, Nassau, June 28; Mangrove Cay, Andros, Aug. 4. MESOGRAMMA SUBANNULATA (Loew ) .
Ten specimens, Nassau, June 28.
MESOGRAMMA sp .
One specimen, Abaco, July 7.
BACCHA CLAVATA (Fabricius) .
One specimen, Mangrove Cay, Andros, Aug. 1. OCYPTAMUS FUSCIPENNIS (Say).
Three specimens, Abaco, July 6, and one from Mangrove Cay, Andros, Aug. 1. VOLUCELLA OBESA (Fabricius).
Four specimens, Nassau, June 28.
VOLUCELLA EUGENIA Williston.
Two specimens, Nassau, June 28, and Abaco, July 6. ERISTALIS VINETORUM (Fabricius). ,
One specimen Nassau, June 28.
ERISTALIS A L B I F R O N S ~ ~ ~ ~ ~ ~ ~ ~ . Two specimens, Mangrove Cay, Andros, Aug. 1. ERISTALIS ATRIMANUS Loew.
One specimen, Mangrove Cay, Andros, Aug. 4. EUPHOROCERA CLARIPENNIS (Macquart) .
One specimen, Mangrove Cay, Andros, Aug. 1.



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19081
JOHNSON - DZPTERA OF THE BAHAMAS
STURMIA AUSTRINA Coquillett.
Nassau. Bred from a Pyralid (H. G. Dyar). STURMIA SUBVARIA (Walker).
Tachina subvaria Walker, Insecta Saund. Dipt ., p. 299, 1856. One specimen, Abaco, July 6.
GONIA PALLENS Wiedemann.
One specimen, Nassau, June 28.
EXORISTA sp.
One specimen, Mangrove Cay, Andros, Aug. 1. MELANOPHORA RORALIS (Linnk) .
One specimen, Mangrove Cay, Andros, Aug. 4. PECI<IA PLUMIPES Desvoidy.
Two specimens (8 9 ) Mangrove Cay, Andros, Aug. 4. SARCOPHAGA INCERTA Walker.
Numerous specimens, Mangrove Cay, Andros, Aug. 1-4. SARCOPHAGA DIVERSIPES Coquillett.
Four specimens Mangrove Cay, Andros, Aug. 4. These agree quite well with
the description; there is a tendency for the anterior femora to be entirely black, and the yellow on the tip of the abdomen, to encroach upon the fourth segment. It was described from Porto Rico.
SARCOPHAGA HELICIS Townsend.
Helicobia helicis Coquillett, Proc. Acad. Nat. Sci. Phila., p. 317, 1895. Numerous specimens, Nassau, June 28, Mangrove Cay, Andros, Aug. 1-4. In the present unsettled state of the Sarcaphagidae it seems best to retain it in this genus.
SARCQPHAGA RUFIPALPIS Macquart.
8. rufipalpis Macq., Dipt. Exot., 11, pt. 3, p. 102, 1843. Eleven specimens, Nassau, June 28, and Mangrove Cay, Andros, Aug. 1-4.



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0 \f
L-431 bn~l [August
The males agree in every respect with the description, and seem to be readily dis- tinguished in having the palpi yellowish, face and front silvery white pruinose, the second and extreme base of the third joint of the antennae reddish, the posterior border of the fourth segment and the genitalia reddish and the posterior tibiae with a wide fringe of long hairs. In the females the palpi is somewhat darker in most of the specimen, and the fourth segment of the abdomen entirely red. They vary in length from 10 to 13 mm. The species was described from Brazil, and has been reported from Curaqao.
SARCOPHAGA sp.
Two specimens, Mangrove Cay, Andros, Aug. 1. This species closely resembles
S. rufipalpis Macq., but the posterior tibiae has not the fringe of long hairs. SARCOPHAGA sp.
A small species (5 to 6 mm.) from Mangrove Cay, Andros, Aug. 1. It cannot
be readily determined in the present unsatisfactory condition of many of the species of this difficult genus.
SARCOPHAGULA IMBECILLA Van der Wulp.
S. imbecilla v. d. Wulp, Biol. Cent. Amer., 11, p, 289, 1896. Numerous specimens, Abaco, July 6, Mangrove Cay, Andros, Aug. 1-4. I also have specimens before me from Kingston, Jamaica (C. W. Johnson). Havana,
Cuba (C. F. Baker) and Biscayne Bay, Florida (Mrs. A. T. Slosson). The frontal stripe varies from black to reddish brown, or black with the lower portion reddish, as the bristles on the third longitudinal vein are present in all the specimens, those with the "reddish frontal band" cannot be referred to 8. tennis v. d. Wulp, also described from Mexico. The specimens vary in length from 3 to 4.5 mm.
SAROTHROMYIA FEMORALIS (Schiner) .
Sarcophda fernoralis Schiner, Novara, Dipt ., 315, 1868. Three specimens, Mangrove Cay, Andros, Aug. 1. I also have specimens from St. Augustine, Florida (C. W. Johnson) : Lake Worth, Florida (Mrs. A. T. Slosson,) : Port Antonio, Jamaica (Johnson).
CHRYSOMYIA MACELLARIA (Fabricius) .
Two specimens, Nassau, June 28. Widely distributed throughout North and



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1908] JOHNSON- DZPTERA OF THE BAHAMAS I I South America, and commonly referred to as the "screw-worm," and the Compsom- via macellaria of many authors. Over twenty-five specific names have been applied to this species.
MUSCA DOMESTICA Linn6.
Two specimens, Mangrove Cay, Abaco, Aug. 1. The House-fly, cosmopolitan.
STOMOXYS CALCITRANS (Linn6).
Two specimens Nassau, June 28.
The Cattle-fly, also cosmopolitan.
COENOSIA OVATA Stein.
Two specimens, Mangrove Cay, Andros, Aug. 1. HOMALOMYIA FEMORATA Loew.
One specimen Nassau, June 28.
LIMOSINA ILLOTA (Williston).
Borhorus iUotus Will., Trans. Ent. Soc. London, 1896, p. 434, pi. 14, fig. 164. One specimen, Mangrove Cay, Andros, Aug. 1. SAPROMYZA CINCTA Loew.
Numerous specimens. Nassau, June 28; Mangrove Cay, Andros, Aug. 1. SAPEOMYZA GRATA Wiedemann.
S. grata Wied., Auss. Zw. Ins., 11. 456, 1830. Brazil.
Eight specimens, Nassau, June 28; Mangrove Cay, Andros, Aug. 1-4. Dis-
tinguished from 8. octopunctafa Wied (8, ingrata Will.), in having the two round, deep black spots on the scutellum at the base of the apical bristle, and not on the sides be- tween the bristles.
, LONCHAEA RUFITARSIS Macquart .
Four specimens, Nassau, June 28. Apparently a widely distributed species, (New Hampshire to Mexico).
With the limited material before me it is difficult to define the many described species, some of which are very closely related or iden- tical.




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[August
EUXESTA ABDOMINALIS Loew .
Four specimens, Nassau, June 28.
EUXESTA ANNONAE (Fabricius) .
Three specimens, Mangrove Cay, Andros, Aug. 1. ACIURA INSECTA (Loew ) .
One specimen, Mangrove Cay, Andros, Aug . 1. Aciniu picciolu Bigot, in Sagra's, Cuba, VII, 842. Tab. XX, fig. 10, 1857. Trypetu humilis Loew, Mon. N. A. Dipt., I, 81, 1862. Numerous specimens, Mangrove Cay, Andros, Aug. 1-4. Common through- out the Greater Antilles, Bermuda, Florida, Colorado and Mexico. According
to the present rules of nomenclature, I do not see how Bigot's name can be set aside. hew acknowledges that the synonymy is not doubtful, for he says:- "Through the kindness of Mr. Gundlach, I have been put in possession of numerous typical speci- mens."
An objection to the name cannot be considered a valid reason for placing it in the synonymy.
EUARESTA MELANOGASTER (Loew ) .
One specimen, Nassau, June 28.
Four specimens Nassau, June 28; Mangrove Cay, Andros, Aug. 1. SEPSIS INSULARIS Williston.
Three specimens, Nassau, June 28.
PSILOPA ACICULATA hew.
~even,!s~ecimens, A Nassau, June 28.




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19081
JOHNSON - DIPTERA OF THE BAHAMAS
PSILOPA CAERULEIVENTRIS Loew .
One specimen, Nassau, July 28,
PSILOPA NIGRIMANUS Williston. '