336 S. W. Williston — North American Con,ops. 



dust above which extends inwards on the front border of the thorax 

 and behind nearly to the roots of the wings; pleurae with an indis- 

 tinct white stripe ; uietanotuni above and the two spots on the 

 sides with grayish yellow dust. Abdomen quite black, the first and 

 second segments with rather narrow bands of yellowish dust ; on the 

 thii'd segment only a finely yellowish dusted ])osterior line; the 

 fourth and fifth segments of the male abdomen with a similarly 

 dusted somewhat broader posterior border ; the fifth segment with a 

 very narrow posterior line ; the last two segments in both sexes with 

 yellow dust. The extension of the fifth segment below in the female 

 as in [tihiolis], but the last segment somewhat shorter. The colora- 

 tion of the wing and the neuration wholly as in my specimen of 

 \tAlnalis\. Length of body as in \tibiaKs\y 



C. castanopterus Loew. 



Neue Beitr.. i, 33. 



"A third species further removed from \tihialis\\)\\{ moie nearly 

 related to (/e)iualii<. It is most readily distinguished by the more 

 blackish brown color of the anterior part of the wings, which is 

 distinctly clearer before the first longitudinal vein, by the ferrugin- 

 ous color of the humeri, the lateral margins of the thorax, the scutel- 

 lum, and a larger or smaller, sometimes a very large part of the ab- 

 dominal segments and the legs. The third joint of the antennte is 

 at the end yet more attenuated ; on the cheeks a large yellow spot 

 lies between the biown. In all else quite as in (jeniiolw. (Tcorgia, 

 Carolina." 



Conops furcillatus, u. sp. 



y ('. (efMops Wlk.. J>ist.. etc., iii, 071. 



S $ . Face waxy yellow, facial grooves not darkened, clieeks black. 

 Proboscis black, not much swollen at the base. Vertical callosity 

 black, bordered in front with opaque black, extending as a niediau 

 stripe to the anteniui^ and there divaricating and passing as a black 

 line upon each side of the face. Antenna^, brownish black, first and 

 third joints more i-eddish below, first joint very short, scarcely a 

 third as long as second, third joint about half as long; third joint 

 of style short, conical. Occiput black, broadly dusted with whitish 

 below the vertex. Dorsum of thorax black, more or less reddened 

 near the ))orders; humeri with a spot of yellowish white dust on their 



