«t DIPTERA 
Third antennal joint mot lengthened ; middle segments of the 
abdomen with hair-like selule ; wings narrow, the anal angle 
greatly reduced ; costa with long cilia (Pl. 4, Fig. 36) . . Subgenus CrENoDnarzETIS, Bezzi. 
19. Legs without strong bristles, no tibial spur ; second joint of antenue : 
without a seta or with but a short oue; notum densely covered 
with appressed pubescence, no. humeral or discal bristles Present. Subgenus DnaPErIS, Meigen. 
Legs with bristles and the hind üibie with an evident terminal 
spur ; second joint of antenna with a sirong seta beneath ; pubes- 
cence of thorax more erect, humeral and sometimes discal 
bristles present (Pl. 4, Fig. 84). . . . . . . . . Subgenus EupnarzrIs, Melander. 
GENUS TACHYPEZA, MEIGEN 
Tachypeza, Meigen, Syst. Beschr. Vol. 6, p. 341 (1830); ibidem, Vol. 7, p. 94 (1838); Zetterstedt, 
Fauna Ins. Lappon. p. 345 (1838); Dipt. Scand. Vol. r, p. 312 (1842); Rondani, Dipt. Ital. - 
Vol. 1, p. 147 [1856] (Tachypesa); Bigot, Ann. Soc. France (3), Vol. 5, p. 563 (1857); Loew, 
Vae Ent. Breslau, Vol. 17, p. 15 (1864); Bigot, Ann. Soc. Ent. France (6), Vol. 9, p- 124 
(1889); Williston, Man. N. Amer. Dipt. p. 75 (1896); Becker, Mitteil. Zool. Mus. Berlin, Vol. 2, 
p. 42 (1902); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 258, 261 (1903); Melander, Williston's 
Man. N. Amer. Dipt. p. 222 (1998); Kertész, Cat, Dipt. Vol. 6. p. 136 (1909); Coquillett, Proc. 
U. S. Nat. Mus. Vol. 37, p. 611 (1910); Lundbeck, Dipt. Danica, Vol. 3, p. 262 (1910); Melander, 
Psyche, Vol. 17, p. 49 (1910); Wahlgren, Ent. ''idskr. Vol, 31, p. 45, 87 (1910); Broneiti, 
Fauna Brit. India, Dipt. Vol. 1, p. 378 (1920). 
Characters. — Slender, moderate-sized species of black coloration, with usually nebulous wings 
and nearly devoid of hairs and bristles. Head higher than broad, the eyes large, bare, in both sexes 
meeting beneath the antennze particularly along the middle of the face, the facets of nearly uniform size, 
the hinder margin ofthe eye with an anterior curve, but rather angulate at the bottom; front quite 
narrow. its sides nearly parallel, but bowed about the ocellar protuberance which is placed rather far - 
forward and bears three large ocelli but no bristles ; occiput conical, with several short stiff black bristles 
above and numerous white hairs below; cheekslinear. Antennsz two-jointed, without bristles, the outer - 
joint ovate, slightly pubescent, with a long, bare, one-jointed, apicalarista. Proboscis slender, vertical, — 
about one-half as long as the head-height. the labium trilobed at the tip; palpi narrow, one-half as long i 
as the proboscis, tipped with several strong bristles. Thorax oblong, tapering in front of the wings, 
flattened, the humeri large and marked off by coarse grooves; no humeral bristle, one or two short 
stiff notopleural, two rows of microscopic acrostichal setulze, dorsocentrals uniseriate, microscopic except 
the prescutellar one which is usually stiff and large, postalar callus strong but without bristle, two straight 
stiff scutellar bristles; pleurze shining or pollinose, without bristles; abdomen comprising eight segments, : 
the first ventral not chitinized, in the female tipped with two slender styles, in the male the pygidium is 
terminal, globular below. Front legs with rather large coxe& and swollen femora, hind legs long and 
slender, anterior femora and tibize biseriately setulose beneath, middle femora with a basal flexor bristle 
sometimes borne on a tubercle, no tibial spurs, spines or bristles, pulvilli small. Wings slender, 
elongate, no alula, costa extending to the fourth vein, somewhat thickened at the termination of the first 
vein, its hairs very short, costal bristle minute, cilia of anal angle longer and looser; basal cells long, 
posterior crossvein perpendicular or oblique, located just before the middle of the wings and one or 
two times its length beyond the anterior crossvein, first vein ending beyond the middle of the wing, 
