268 ERNEST A. BACK. 



(G. Dimmrock); New Haven, Conn. (May 15); Catskill Mts., 

 N. Y.; N. J. (Smith Cat.); N. J. (E. Daecke, May 10); Va. 



A female from Virginia has hyaline wings without any trace 

 of grayish at the tip, thus agreeing with the Canadian female 

 mentioned by Loew in Berl. Ent. Zeit. This is a very pilose 

 species; the pile upon the prothorax, pleurae and tibiae being 

 very long and fine. 



Middle tarsi of male with brushes of black bristles. 



Cyrtopogon callipedilus (PL VIII, fig. 1.) 



Cyrtopogon callipedilus Loew, Berl. Ent. Zeit., 1874, 358. 



Cyrtopogon callipedilus Osten Sacken, West. Dipt., 296, 1877. 



Cyrtopogon callipedilus Williston, Trans. Am. Ent. Soc, XI, 12, 

 1884; oc. in Wyo. 



Cyrtopogon callipedilus Coquillett, Psyche, IX, 149, 1902; oc. in 

 N. M. 

 " ^ 9- — Length, % 11- 12 mm.; $,11-13 mm. — % . — Black; thoracic 

 dorsum with a very weak brownish bloom, forming an indistinct gem- 

 inate stripe in the middle and some ill-defined marks on the sides; 

 long white pile on the face, the lower part of the occiput, front part of 

 the thorax, fore coxae and the sides of the first two abdominal segments; 

 black pile on the remainder of the abdomen and the top of the head; 

 some scattered black hairs in the mystax above the mouth. Femora 

 black, with long, soft, white pile; tibia? reddish, beset with blackish 

 pile; tarsi black, except the first segment of the hind four tarsi, which 

 is often reddish to a greater or less extent from the root; the front 

 tarsi, beginning with the second segment, are densely beset on their 

 upper side with recumbent, short, silvery hairs, parted in the middle; 

 the under side of the same segment is densely beset on both sides with 

 short black bristles; the last two segments of the middle tarsi have 

 on each side a dense, flattened tuft of black bristles, which form to- 

 gether a kind of disk, which is a little broader than long. Wings 

 grayish hyaline, more hyaline on the proximal half. 



9 . — Head, and especially the face, covered with dense whitish-gray 

 bloom, the thoracic dorsum covered with a brownish-gray bloom, 

 completely concealing the black ground color, except at the four 

 corners and on the scutellum, which is black, polished; a geminate 

 darker line in the middle of the dorsum, not reaching the scutellum; 

 pleurae likewise clothed with a dense yellowish-gray bloom. Abdomen 

 polished black, the hind margins of segments 2-5 with white triangles 

 on each side. The hairs on head and thorax are like those of the male, 

 but of a less pure white; the white hair on the sides of the abdomen 

 reaches to its tip, gradually becoming shorter. Legs like those of the 



