Vol. 5, p. 59-61. June 8, 1923. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



TWO NEW NORTH AMERICAN DIPTERA. 



, BY C. HOWARD CURRAN. 



AsiLIDAE. 



Cyrtopogon laphriformis, new species. 



Similar to Laphria in form, the abdomen long and slender, longer than the 

 wings, with orange pile except basally; pleura entirely white-haired. 



Male. ■. — Length, 15 mm. Face moderately gibbose, rather fiat above, gray- 

 ish-white pollinose, the mystax pallidly yellowish in the middle, the hairs else- 

 where stouter, black. Front very thinly pollinose, shining, with evident, 

 abundant small punctures and not very long, rather abundant hair, which is of 

 intermediate texture. Occiput grayish-white pollinose, more yellowish toward 

 the vertex; hairs all black, the beard composed of fine white hair which does not 

 quite reach the eye-margin. First antennal joint one and one-fourth times as 

 long as wide, gradually increasing in width from the base; second joint slightly 

 shorter than the first, but not as wide, as it is about one and one-half times as 

 long as wide, both bearing black hairs; third joint somewhat longer than the two 

 first combined, not half as wide as the second joint, the sides sub-parallel, but 

 still a little concave on the basal half below, scarcely so above; style as long as 

 the second antennal joint, of moderate width, slightly tapering, its spine short 

 and not well differentiated. 



Thorax black, the sides of the mesonotum and pleura grayish-white or yel- 

 lowish pollinose, but I am unable to make out the pattern on the disk. Pile on 

 pleura, humeri and a narrow band on the posterior margin of the mesonotum, 

 fine, white; on the disk, stouter, black, not abundant nor long; bristles slender, 

 black. Scutellum very gently convex, its base narrowly thinly gray pollinose, 

 its pile whitish, becoming longer apically; no bristles. 



Legs shining black, the extreme apices of the femora, basal fourth of the 

 tibiae and the bases of all the tarsal joints, reddish or deep orange, strongly con- 

 trasting with the black. Pile on posterior four femora fine, white, except sev- 

 eral apical bristly hairs and a few additional hairs on the middle ones above. 

 Front femora black-haired. Tibiae black-haired, the hairs beneath the front 

 four conspicuously long. Tarsi all black-haired. Bristles all black. 



Wings rather peculiar as they are beset with quite apparent brown villi 

 which give a smoky tinge and are quite dark on the apical two-thirds and some- 

 what brownish. When viewed from almost the same plane they appear wholly 

 brownish. Squamae pallidly yellowish, with yellow border and fine white 

 fringe. Halteres reddish yellow. 



Abdomen shining blue-black, the second to fifth segments each with a trans- 

 verse grayish pruinose triangle on the posterior angles, its front margin almost 

 straight and oblique, the sides of the first segment with similar pollen. Pile 

 short on the disk, longer and more abundant laterally, whitish at the base, 

 becoming orange on the second segment, from thence to the apex entirely 

 orange and of almost equal length, the genitalia alone with some longer, stouter 

 black hairs. 



Holotype. — d", Intervale, New Hampshire, June 26, 1909 (S. A. Shaw), in the 

 Museum of the Boston Society of Natural History. 



59 



