FAM. EMPIDID/E 289 
Legs in large part yellow; front polished; pygidium without 
specialized bristles . . . MOL NON. D I E MEDI ue uF se Im Coi ori e 
3. Third and fourth veins I bpeneiel Ste iS A mi d Ma pues ise QU dA 
Third vein curving forward, diverging from the toic. . . T. siwPLICIOR, Wheeler & Melander. 
4. Occiput coated with dust; wings nearly uniformly infumated; 
Domtubies quer ciapofemord- icd woe cde C Fulco vesc ome cm. ro Se 
A broad orbital stripe polished; base of wings pale, remainder 
infumated; front tibiae and femora concolorous . . . . T. GAGATINA, nov. sp. (1). 
5. Front tibiae black; fourth vein ending at wing-tip. . T. cAPNODES, nov. sp. (2). 
Front tibiae piceous; fourth vein ending beyond wing-tip . . T. Scurrpi, nov. sp. (3). 
6. Hind metatarsi with a long black spine; palpi broad; legs 
velowldqu uu Um uo e csi dU Eck es TT LONGISPINA, nov. Sp. (4). 
MORE SDIMe c uox ML E D EMQUE I LAU. Tr o PATRE E le 
bristles. Abdomen overlaid with dark brown pollen, pygidium contorted and usually open, the curved apical process 
slender and bearing two strong black sete at base on right side. Legs blackish, the tibi and base of tarsi brown, coxal 
hairs yellow, other hairs brown.  Halteres yellow, calypteres and fringe dusky. Wings smoky, especially dark in marginal 
and submarginal cells, veins black and strong, sections of costa proportioned 1o : 11 : 9 : 3, third and fourth veins parallel 
toward end, the fourth ending beyond wing-tip, first basal cell two-thirds as long as second, sections of fifth vein 7 : 10 
Female. Antennal joints concolorous, dark ; front wholly polished. 
Twenty-four specimens, procured from Pablo Schild, La Suiza de Turrialba, Costa Rica, collected in various 
months; two specimens, San Jose, Costa Rica (Sturtevant). The legs may sometimes be more or less brownish. 
(1) Tachyempis gagatina, nov. sp. — Differs from capnodes as follows : occiput broadly polished along the orbits, 
the first antennal joint of male yellowish, the apical joint brown, of female both joints black, arista two and a quarter times 
antennallength. "The gray tone to the pruinosity of lower pleurze and cox scarcely evident; pygidium short, small, closed, 
hairy, the terminal curved process thin and devoid of specialized bristles; legs mostly testaceous yellow, the front tibiae not 
darker than their femora, the hind femora only a little brownish on apical half. Base of wings subhyaline, remainder 
uniformly infumated, costal sections about 0.6 : 1 : 0.6 : 0.3, first posterior cell about three-fourths as wide as the 
submarginal opposite the end of the second vein, fourth vein ending beyond wing-tip, sections of fifth vein 2 : 3. 
Six males, one female, La Suiza de Turrialba, Costa Rica (P. Schild). 
(2) Tachyempis capnodes, nov. sp. — Female. Length 1.5 mm.  Occiput opaque black, only a linear orbital 
stripe shining, front polished, at the vertex as wide as antennal length, below as wide as the outer antennal joint, the single 
ocellar and vertical bristles black; palpi glistening white, with a white seta, proboscis black; antennae black, the subdorsal 
arista two and a half times the antennallength. ^ Mesonotum polished, extreme margins of notum and all of pleurz polli- 
nose, black, becoming silvery gray toward and on vosterior coxa. Abdomen subopaque black. Legs very sturdy, entirely 
bristleless, brownish yellow, front coxee black at base merging to the yellow tip, touched with gray pruinosity on front face, 
front tibiz entirely black, hind femora blackish on apicalthird. Halteres with yellow stem and white knob. Wingsstrongly 
and uniformly infumated, sections of costa beyond humeral crossvein proportioned 1 : 1 : 0.6 : 0,3, first posterior cell relati- 
vely narrow, about two-thirds as wide as the submarginal opposite end of second vein, fourth vein gently curving forward, 
ending at wing-tip, sections of fifth vein about 4 : 5. 
Holotype, La Suiza de Turrialba, Costa Rica, August, 1922 (P. Schild). 
(3) Taehyempis Schildi, nov. sp. — Differs from cafzodes as follows : Occiput dusted up to the eyes ; arista nearly 
three times the antennal length, basal antennal joint of male yellow, the outer joint black, of female the antennae wholly 
black; gray pruinosity of lower pleurze and of coxe scarcely evident; pygydium open, the curved terminal process without 
specialized bristles ; front femora less robust, front tibie piceous, becoming paler at apex; costal sections proportioned 10 : 
1:7:3, first posterior cell about three-fourths as wide as the submarginal opposite end of second vein, the fourth vein 
ending beyond apex of wing, sections of fifth vein 3 : 4. 
One male and one female, La Suiza de Turrialba, Costa Rica, procured from Pablo Schild. "The species is dedi- 
cated to Mr. Schild, whose diligent collecting has made possible the recording of seven of the new species of the genus. 
(4) Tachyempis longispina, nov. sp. — Length 1 mm. Uniformly cinereous gray, the legs yellow, hind 
metatarsi with a long black spine, wings hyaline. Front narrowly V-shaped, ocelli moderate in size; no ocellar bristles : 
antenne reddish, the outer joint short oval, the terminal arista nearly four times the length of the antenna. Palpi broad, 
white, not fringed; proboscis short and vertical, black. Occipital hairs white, sparse. "Thorax not elongate, the humeri 
evident but not markedly constricted ; only a few microscopic bristles present on the notum before the scutellum ; four 
minute scutellar bristles. Hypopygial claspers fringed with hairs beneath. Legs including the coxe yellow, the hind 
femora brownish toward tip, hairs sparse, minute and white, but the hind metatarsi of the male tipped with a slender black 
