NORTH AMERICAN DIPTERA. 57 



scribe a number of new species from illy preserved specimens. The 

 genus Asilus {sensu lat.) with its numerous species I have reserved for 

 a future paper. 



C. 



Asilinte. — Marginal cell of the wing closed ; antennae with a terminal bristle. 



1. — Bristle of antennae plumose Ommatius. 



Bristle not plumose 2. 



2. — Terminal portion of the third vein curved forwards to meet the costa; usually 



two sub-marginal cells 5. 



Terminal portion of third vein curved backwards to meet the margin of the 



wing at or beyond the tip 3. 



3. — Two sub-marginal cells Asilus (sensu lat). 



Three sub-marginal cells -1. 



4. — Abdomen shorter than the wings ; body thickly pilose, claws obtuse. 



flallophora. 



Abdomen longer than the wings ; body thinly pilose Proinacliiis. 



5. — Oviduct cylindrical, with a terminal circlet of spines. ...Proctacanthiis. 

 Oviduct laterally flattened, without circlet of spines £rax. 



l»IAl,L,OPHORA. 



Macquart, Hist. Nat. Dipt., i, 300; 1834. 



1. — First posterior cell closed, or nearly so 2. 



First posterior cell wide open; large species 4. 



2. — Fourth, fifth and sixth segments of the abdomen with black pile above. 



lapliroides. 



Abdomen without black pile 3. 



3. — Femora, tips of tibise, and the tarsi black claasicella. 



Legs reddish yellow, except black spots on the femora Guildiana. 



4. — Scutellum and abdomen wholly black pilose above ni^ra. 



Scutellum and abdomen chiefly light pilose 5. 



5. — Venter black pilose; light colored pile usually bright yellow orcina. 



Venter grayish white pilose boiuboides. 



M. ardeus Macquart, Hist. Nat. Dipt, i, 302, 4; Dipt. Exot. i, 2, 89, 12; tab. 

 viii, fig. 2. — N. America. 



Ilallophora bomboides. 



Asilus bomboides Wiedemann, Dipt. Exot. i, 203, 37; Auss. Zw. Ins. i, 476, 77. 

 Mallophora bomboides Macquart, Hist. Nat. Dipt, i, 302, 2; Dipt. Exot. i, 2, 89, 11. 



% — Length 25-27 mm. Large, black. Face black, a little shining in the mid- 

 dle, somewhat pollinose on the sides; a few short, black hairs near the base of the 

 antennae, the sides and upper part of the face bare ; in the middle, extending two- 

 thirds of the way to the antennae, the proboscis, and posterior orbits, with dense, 

 long, abundant, white pile, somewhat tinged with yellow; posterior orbits on the 

 sides thickly white pollinose. Dorsum of thorax brownish black, on the humeri 



TEANS. AMER. ENT. SOC. XII. (12) JANUARY, 1885. 



