AMERICAN DIPTERA. 347 



Dr. Williston, his specimen of his Mexican pulcherrimus, and 

 through that of Dr. Hermann of Germany, Loew's notatus, in 

 both of which there are no bristles or denticles on the scutellar 

 margin, and the abdomen of pulcherrimus is quite similar in 

 shape to that of abbreviatus. 



There are in the National Museum specimens of abbreviatus 

 and bicolor pinned in coitu, thus proving that they are the same 

 species. This is what one might expect in this genus (see 

 notes on combustus and dispar.) 



Prof. Johnson's bicolor is a female, not a male, as published. 

 The specific name bicolor was used by Jaenicke in 1867 in his 

 Neue Exotische Dipteren. 



Saropogon combustus. 



Saropogon combustus Loew, Berl. Ent. Zeit., 1874, 373. 



Saropogon adustus Loew, Berl. Ent. Zeit., 1874, 375. 



Saropogon combustus Williston, Tr. Am. Ent. Soc, XI, 23, 1884. 



Saropogon adustus Jones, Trans. Am. Ent. Soc, XXXIII, 279, 

 1907 (doubtful determination from Nebr.). 



Saropogon dustus Howard, Insect Book, 1902, PL XIX, fig. 8. 

 <^ 9- — Length 13.5-15 mm.. — Male. — -Black; legs and wings of the 

 same color; head and dorsum pale golden pruinose; pleurae reddish- 

 brown pruinose; mystax white; coxae black with black bristles. Fe- 

 male. — Head and abdomen reddish; segments 1-5 of latter black on 

 the sides and with the posterior lateral margins whitish pruinose; 

 wings yellowish. 



(^ . — Black; face, front, occiput, dorsum and scutellum light golden 

 pruinose; the dorsum when viewed from before, nearly uniformly 

 pruinose, when viewed from above, showing indistinct traces of a dark 

 median geminate stripe and two lateral stripes greatly abbreviated 

 anteriorly; pleurae and coxae dark brown pruinose. Mystax white; 

 bristles of antennae, frontal orbits, ocellar tubercle, upper occiput and 

 on the thoracic dorsum and scutellum yellowish ; the fine hair of the 

 thoracic dorsum of same color, finer and longer than in dispar; cloth- 

 ing of rest of occiput, palpi, proboscis, prothorax, hypopleurae, coxae 

 and abdomen wholly black, polished, the pile being very short on the 

 tergum of abdomen, longer and thicker on the sides and venter. Hy- 

 popygium black. Legs black; all the bristles whitish except a few on 

 the hind tibis; pile of femora black, short on the upper side, longer 

 beneath; front and middle tibiae appear less black than the hind pair, 

 due to the nearly uniform paleness of their hairs; the short, almost 

 rust-brown hair of the tarsi give them a pitchy-brown appearance in 

 many specimens. The third antennal segment and the tibiae and tarsi 

 are sometimes pale. 



TRANS. AM. ENT. SOC., XXXV. AUGUST, 1909 



