292 DIPTERA 
End process slender; halteres black; hind femora mostly 
black; palpi c black. T. HALTERATA, nov. Sp. (1). 
Geographical distribution. 
1. T. agens, Melander, Psyche, Vol. 17, p. 59, f. 2, 19 [1910] (Tachydromia). Washington. 
2. T. apicis, Williston, Trans. Ent. Soc. Lond. Vol. 3, p. 442, pl. 16, f. 167 West Indies. 
[1896] (Drapetis); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 209 
[1902] (Drafetis); Bezzi. Nova Acta Akad. Nat. Halle, Vol. 9r, 
P- 397 [1909] (Cfenodrafetis). 
insularis, Melander, Psyche, Vol. 17, p. 58, f. 17 [1910] (Tachydromia). ' 
3. T. calva, Melander, Psyche, Vol. 17, p. 58, f. 18 [1910] (Tachydromia). Georgia. 
4- T. cafuodes, nov. sp. Costa Rica. 
5. T. cinerea, nov. sp. New Mexico. 
6. T. dichroa, Bezzi, Denkschr. Med. Nat. Ges. Jena, Vol. 13, p. 183 [1908] S. W. Africa. 
(Tachista). ; 
7. T. epibosca, nov. sp. Costa Rica. 
8. T. gagatina, nov. sp. Costa Rica. 
9. T. halterata, nov. sp. Costa Rica, 
10. T. hyalipennis, Macquart, Dipt. N. France, Vol. 3, p. 92 [1827] (Tachy- W. Europe. 
dromia); Hist. Nat. Dipt. Vol, 1, p. 351 [1834] (Tachydromia); 
Meigen, Syst. Beschr. Vol. 7, p. 96 [1838] ( Tachyfesa). 
11. T. longispina, nov. sp. West Indies. 
12. T. nervosa, nov. sp. California. 
13. T. nigra, nov. sp. Costa Rica. 
14. T. fpictipes, nov. sp. — PI. 4, Fig. 35. Costa Rica. 
15. T. ruficornis, nov. sp. Costa Rica. 
16. T. Schildi, nov. sp. Costa Rica. 
17. T. simplicior, Wheeler & Melander, Biol. Centr. Amer. Dipt. Suppl. p. 375 Mexico. 
[1901] (Phoneutisca); Melander, Trans.Ann. Ent. Soc.Vol. 28 p. 205,f. 6 
[1902] (Phoneutisca) ; Psyche, Vol. 17, p. 57, f. 15 [1910] (Tachydromia). 
18. T. tetrachata, nov. sp. Chile. 
19. T. universalis, Melander, Psyche, Vol. 17, p. 6o f. 16 [1910] (Tachydromia) United States. 
20. T. vitripennis, Bezzi, Denkschr. Med. Nat. Ges. Jena, Vol. 13, p. 182 S. Africa. 
[1908] (Tachista). 
6. GeNUS CHARADRODROMI|A, NOV. GEN. 
Characters. — Rather robust, opaque pollinose species measuring one to two millimeters. 
Head narrower than the thorax, globular, occipital setule sparse, two vertical bristles, the inner pair 
convergent, two divergent ocellar bristles; eyes well separated, the lower hind margin shallowly excised, 
(1) Tachyempis halterata, nov. sp. — Male. Length2 mm. Black, occiput lightly dusted over all, front relat- 
ively narrow, the sides parallel above the front ocellus where the front is no wider than the antennal length, vertical bristles a 
little smaller than the ocellar pair, both black, ocelli moderate in size; antennae brown, arista thin, four times the antennal 
length, brown at base, otherwise yellowish; palpi black, elongate oval, the outer face glistening white in certain lights. 
"Thorax dusted with dark brown, the pleurz beccming grayish brown toward coxze, the two notopleural, single supra-alar 
and four scutellar bristles black, about six acrostichal and seven dorsocentral setule. Abdomen black, with brown coating, 
pygidium rather long, the apical process with long, thin curved termination which bears four thin setze on the right side. 
Legs rather slender, coxze and anterior legs largely yellowish, the femora brown above knees, hind femora black except at 
base, hind tibiz black at base merging to yellow at apex, last joint of all tarsi brown, no flexor setze or thorns present. 
Halteres, ca!ypteres and fringe black. Wings strongly infumated, paler between humeral crossvein and origin of second 
vein and along hind margin, veins black, costal sections proportioned about: 1:1:1:0.4, fourth vein ending beyond 
wing-tip, the first posterior cell about two-thirds as wide as the submarginal opposite end of second vein, sections of fifth 
vein 5 : 6, . 
Holotype, La Suiza de Turrialba, Costa Rica (P. Schild). 
