60 NORTH AMERICAN DIPTERA. 



being broadly black and black pilose, and perhaps also in the anterior 

 cross-vein not being opposite but distinctly beyond the base of the first 

 sub-marginal cell. 



Mallophora (liiiildiana n. sp. 



'^ 9- — Length 11-13 mm. Black. Head wholly white pilose, except sometimes 

 a few black hairs on the basal joints of the antennae. Face, as far as seen beneath 

 the pile, white pollinose. Occiput densely white pollinose. Dorsum of thorax 

 moderately thickly whitish pollinose and with short, thin, yellowish white pile, 

 longer behind. Scutellum thickly white pilose. Pleurse thickly whitish pollinose 

 and with white pile. Abdomen depressed, lighth' pollinose on the sides, wholly 

 clothed with moderately abundant, yellowish white pile, white on the second 

 segment, sparse, allowirg the black ground-color to be readily seen oh the anterior 

 part of the segments, on the posterior part of each segment with a band of white 

 pollen. Legs yellow, tip of femora, and the tarsi, darker or reddish ; a black spot 

 on the upper anterior part of all the femora, smallest on the front pair; pile 

 wholly yellowish white, the hind femora on the outer side below, and above near 

 the tip, the outer posterior border of the hind tibise, and the upper part of the 

 hind tarsi, with slender black bristles; tip of all the tibise on the inner side and 

 all the tarsi with short black bristles. Wings wholly hyaline; first posterior cell 

 closed, or nearly so. 



Hah. — W. Kans., Mont., N. C. Five specimens collected by my 

 friend, Mr. E. W. Guild, to whom I am indebted for not a few speci- 

 mens from Western Kansas ; also one from Montana (Prof. J. H. Corn- 

 stock). 



I am not at all sure but that this will prove to be only a variety of 

 clausicella. 



PROMACHUS. 



Loew. Linn. Ent. 390; 1848. 



1. — Abdomen with a broad black spot in front of each segment, behind and on 

 the sides densely yellowish brownish pollinose ; hypopygium without silvery 



white pile above 2. 



Abdomen not so marked, hypopygium with silvery white pile above ?>. 



2. — Thorax deep reddish brown vcrtebratiis. 



Thorax grayish riifipe!!*. 



3. — Abdomen uniformly grayish pilose, except the narrow incisures Fitclkii. 



Abdomen not uniformly pilose 4. 



4. — Abdomen densely brown pollinose on the sides 5. 



Abdomen grayish pollinose on the sides, extending across narrowly on the 



hind margins of the segments priiiceps. 



5. — Hypopygium of male small, legs chiefly black albifacieiii. 



Hypopygium not small, legs chiefly yellowish red Bastai'dii. 



Proniacliiis Wiedemann, Dipt. Exot. i, 201, 34; Auss. Zw. Ins. i, 485, 90 

 {Asilus).—G!a. 



