290 |  DIPTERA 
7. Second section ot costa longer than third, usually one and 
one-half to two times thethird. . . . . . MEM SCIEN uU S s 
Second and third sections of costa subequal, or the second i 
shorter than thethird. . . ... . : E M uc EE UU T iE 
8. Front almost linear above and below the oculis triangle; 
wings more or less clouded; femora apically and front 
übiecentralydaertk . . 5. o. 2s. T.nenme, no d OE 
Front more or less V-shaped . . i MEUDUUDE tM Uu REPEUEC den i 
9. Upper half of front polished, lower half gray Solifoode: vulsí 
longer than broad, white; sections of fifth vein equal . . T. CINEREA, nov. sp. (2). 
Upper part of front dusted quiteas muchaslower. . . . . . . . . . . . . . , IO. 
10. Sections of fifth vein equal, veins mostly strong and black; 
palpi longer than wide . . . $ x . T. NERVOSA, nov. sp. (3). 
Last section of fifth vein longer ibán préceding. veins ibin; 
palpi nearly as broadaslong . ... . . .—. . V oW X UD. M ES 
spine which is as long as the metatarsus and attains theend of the following joint. Halteres white; calypteres bare. Wings 
nearly hyaline, slightly clouded near the middle, the second and third sections of the costa subequal, third and fourth veins 
parallel, last section of the fifth vein slightly longer than the preceding section, posterior crossvein two-thirds as long as the 
distance between the crossveins, 
Five specimens, Havana, Cuba (C. F. Baker), and Jamaica (R. Thaxter). 
(1) Techyempis pictipes, nov. sp. (Pl. 4, Fig. 35). — Length 2 mm. Black, with brownish tinge. Head very 
narrow, higher than wide, occiput lightly but completely gray-dusted, its lower hairs pale; front cinereous, almost linear, 
bulged at the very narrow ocellar triangle, vertical bristles almost touching; antennz yellowish, the arista three and a 
half times the antennal length; palpi narrow and long, white, tipped with a long yellow seta, proboscis black. Thorax 
narrow, uniformly and lightly dusted with grayish, one each of humeral, notopleural, dorsocentral and supra-alar bristles, 
apical scutellars distant, Abdomen dull brown, the recurved apical process narrow. Front femora robust, fringed with 
long yellow setze beneath, coxae and most of legs yellow, the middle of the anterior tibize and the distal part of the posterior 
epe. brown. Wings narrow, hyaline at base, otherwise lightly infumated, veins brown, sections of costa proportioned 
: 10 : 7 : 3, of fifth vein 4 : 5, first posterior cell narrow, ending at apex of wing, but little narrower than the submarginal 
dud end of second vein. Halteres pale yellow, calypteres brown. 
Seven males, three females, La Suiza de Turrialba, Costa Rica (P. Schild). 
(2) Tachyempis cinerea, nov. sp. — Female. Length 1.5 mm. Occiput, thorax and abdomen gray pruinose ; 
legs yellowish: basal joint of the antennz red ; palpi elongate, white and with small white hairs ; two scutellar bristles; no 
acrostichal or dorsocentral bristles; halteres white; wings clear hyaline. 
Front V-shaped, the bottom as broad as an antennal joint, ocelli large, divergent black ocellar bristles present; outer 
antennal joint short, onion shaped, the arista subterminal, three times length of antennae ; eyes completely contiguous on the 
face, the lower facets large; proboscis short, black. Humeri evident and delimited by a distinct furrow, Pleurz densely 
pruinose, the ground color a little reddish near the front coxie, no pleural hairs. * Middle tibize minutely and closely black- 
setulose within. Veins narrow and dark except at the base of the wing, marginal cell long, the second section of the costa 
one and three-fourths as long as the third section, first posterior cell ending at the wing-tip, its veins parallel, the outer sec- 
tions of the fourth vein proportioned 1 : 6, of the fifth vein, subequal. 
Two specimens; Alamogordo, New Mexico, type in the Academy of Natural Science, Philadelphia. This species 
differs from apicis Williston (Drapetis ; — insularis Melander) in that the palpi and halteres are not brownish, the wings show 
no trace of infuscation, the second section of the costa is not equal to the third, the outer section of the fifth vein is not longer 
than the preceding, and in that the front is somewhat broader. 
(3, Tachyempis nervosa, nov. sp. — Female. Length 1.75 mm. Front narrowly V-shaped, cinereous, vertical 
bristles minute, occiput completely dusted; basal antennal joint brown, apical blackish, arista three times the antennal 
length; palpi elliptical, brownish, white at base and with glistening white coating, two small white setze; notum covered 
with brownish gray dust, humeri pronounced, no humeral bristle, seriate setulze very small, posterior dorsocentral present, 
one notopleural, lateral scutellar seta small; pleurze cinereous, not whiter below. Abdomen subshining. Cox and legs 
mostly yellowish, apical half of posterior femora and posterior tarsi brownish, anterior femora with rows of yellow setulae 
below. Halteres yellow, calypteres blackish. Wings hyaline, veins mostly black, the fourth vein thin, the pedicel of the 
second and third veins yellow, costal sections about 1 : 1 : 0 6 : o.2, sections of fifth vein equal, first posterior cell ending at 
apex of wing, third and fourth veins straight, very slightly converging. 
Holotype, Stanford University, California, July, 1915 (Melander). 
