AMERICAN DIPTERA. 265 



Cyrtopogon lutatius. 



Dasypogon lutatius Walker, List, II, 357, 1849. 



Dasypogon lutatius Walker, Can. Ent., Ill, 142, 1871 (oc. in 

 Nova Scotia). 



Cyrtopogon lututius Osten Sacken, Cat., 1878, 281. 

 9- — -Length 7.5-10 mm. — Legs black, bristles of the tibia? whitish; 

 mystax white; abdominal segments, except the first, with interrupted 

 white pruinose cross-bands near the posterior margin; wings hyaline. 

 Front and face grayish pruinose, mystax white extending up to the 

 antennas; antenna? black. Thoracic dorsum brown pruinose, with the 

 usual stripes; the humeral callosities and the sides of the dorsum are 

 covered with a more yellowish-gray bloom, which sometimes also ex- 

 tends more or less distinctly to the intervals between the dorsal stripes 

 and the median line of the geminate stripe; a rather distinct, grayish- 

 white spot on each side of the median geminate stripe, where the 

 transverse suture reaches it; scutellum rather flat, rugose, with but 

 little hair; grayish pruinose in the middle, black on the sides; pleura? 

 grayish pruinose; a polished black spot under the root of the wings; 

 the trichostical pile is a mixture of white and black. Halteres yellow. 

 Abdomen of very nearly equal breadth (the seventh segment distinctly 

 narrowed), convex, black, subpolished; first segment with whitish 

 pruinose spots on the sides; segments 2-7 with white pruinose cross- 

 bands posteriorly; interrupted on segments 2-5, subinterrupted, 

 nearly entire on segments 6-7; they touch the hind margin of the seg- 

 ments on the sides, but diverge from it a little on the tergum above. 

 The sides of the abdomen at the base are clothed with white hairs; the 

 tergum with microscopic pile, which in a certain light, appears golden- 

 yellow. Legs black, tarsi more or less dark chestnut-brown; femora 

 with white hairs, tibia? with white bristles on the under side. Wings 

 hyaline; a grayish tinge on the distal half is hardly perceptible, vena- 

 tion normal. 



Type. — British Museum. There are seven female specimens 

 at the M. C. Z. named by Osten Sacken. 



Habitat. — Nova Scotia (Walker) ; Brookline (C. W. Johnson) , 

 and Chicopee (F. Knabb), Mass; Cayuga L., and Pike, N. Y. 



Prof. C. W. Johnson has captured several specimens in 

 Brookline, Mass., where it seems to be not at all rare. One 

 of his specimens had the pruinose band on the fifth abdominal 

 segment entire. It is not uncommon ahout Amherst, Mass. 



Cyrtopogon lyratus. 



Cyrtopogon lyratus Osten Sacken, Cat., 1878, 232. 

 cf 9- — Length 13-14 mm. — Head black, densely grayish pruinose 

 on the face, slightly so on the sides of the front; mystax altogether 

 black, hairs on the occiput black above, white below; antenna? black, 



TRANS. AM. ENT. SOC, XXXV. (34) JULY, 1909. 



