THE CANADIAN ENTOMOLOGIST. 41 



NEW SPECIES OF NORTH AMERICAN DIPTERA. 



BY D. W. COQUILLETT, WASHINGTON, D. C. 



Family Bombylidse. 

 Metacosvius mancipennts, new species. 



Black, the face, an inverted Y-shaped mark beneath the oral opening, 

 the stems of the halteres and middle of the knobs, white; the bases of 

 the tarsi, apical portion of the front and middle tibiae and extreme base of 

 the hind femora, dull yellowish. Lower end of the front, the occiput and 

 pleura, whitish pruinose. Abdomen polished, the narrow hind margin of 

 segments 2 to 5 whitish pruinose. Wings hyaline, unusually tapering to 

 the base, the axillary cell not wider than the anal cell at its narrowest 

 part, the latter cell very broadly open at its apex, marginal cell greatly 

 widened toward its apex. Length, 5 mm. 



Glenside, Pennsylvania. A male specimen collected July 5, 1909, 

 by Mr. C. T. Greene. Type No. 12764, U. S. National Museum. 



Family Dolichopodidse. 

 Dolichopus virga, new species. 



Male : Near perm'x, but the third joint of the front tarsi of the male 

 less than one-half as long as the second, etc. Head green, face densely 

 whitish pruinose, bristles on lower part of occiput whitish ; antennae 

 wholly black, the third joint pointed, ovate, longer than broad, the arista 

 subapical, tapering to the apex. Body green, the mesonotum and 

 incisures of abdomen tinged with bronze ; lamellse of the hypopygium 

 yellowish, the upper edge narrowly bordered with black. Hairs of the 

 calypteres black. Cox?e black, the front ones, except at the base, yellow, 

 their front side covered with short black hairs and with several black 

 bristles toward their apices ; femora and tibite yellow, a spot at apex of 

 hind femora and the broad apex of the hind tibiae black ; tarsi black, the 

 first two joints of the front ones and base of the first joint of the middle 

 ones, yellow; femora not provided with long hairs, first two joints of front 

 tarsi slender, the first nearly twice as long as the second, third joint less 

 than one-half as long as the second, slightly widening outwardly, fourth 

 joint dilated, scarcely longer than broad, fifth joint more dilated, about as 

 long as the third, the first three joints with very short hairs, the remaining 

 two fringed on each side ; middle tarsi plain. Wings grayish hyaline, 

 costa not thickened, fourth vein not broken, hind margin of wings evenly 

 rounded. Length, 5 mm. ^ 



Female : Like the male, except that the front tarsi are similar to the 

 middle ones in colour and structure. 



February, igio 



