'S'34 S. W. Williston — North American Conops. 



parallel to the great cross-vein till it reaches the last segment of the 

 fourth, which it accompanies to near the tip, and then borders the 

 last segment of the third longitudinal in the second posterior cell; 

 sixth longitudinal vein with a dark brown stripe in fi'ont. Posterior 

 cross-vein but slightly oblique; third and fourth longitudinal veins 

 distinctly angulated at the tips of the small cross-vein. Long, corp., 

 11-13""". Long, al, 9-10""". Thirty specimens. Lidiana (Say); 

 Mass., Conn., J). C, Va., N. C. 



Our most (common eastern species, and very uniform in its 

 markings. Of the synonymy, there can be no doubt. Loew's 

 description of the first and third joints of the antennje being about 

 one-third as long as the second, I can attribute only to an error, as 

 in neither this nor Sagittarius is the discrepancy nearly so great. 

 The diifereuces between tibialis and Sagittarius are such that Wiede- 

 mann's supposition of the synonymy, drawn from Say's brief descrip- 

 tion, is quite excusable and fully accounts for his doubts in giving a 

 new name. The description of tibialis by Say appeared but a short 

 time previous to Wiedemann's second volume of his Zweifliigelige 

 Insecten, and was also apparently overlooked by Loew. The two 

 species are most readily separated by the color of the cheeks, a 

 character which I have found of excellent value in all the specimens 

 of the genus examined by me. 



Two female specimens from Georgia (Morrison), and Texas (Bel- 

 frage), in Mr. Burgess' collection, difier in their much larger size 

 (16"""), and deeper black color throughout, yet they are evidently 

 the same. 



Conops Sagittarius Say {no/i Wied., Loew). 



Joum. Acad. Phil., iii, 83, 2. 



f C. genualis Loew, Neue Beitr., i, p. 32. 



f C. castanopterus Loew, loc. cit. 



$, 9 . Face waxy yellow ; cheeks behind and a transverse spot in 

 front, reddish brown, or brownish black, enclosing a quadrate yellow 

 space ; a white line near the orbits, not extending higher than the 

 antennae. Facial grooves black, lighter in the median line. Pro- 

 boscis reddish brown, black at the end, considerably swollen 

 at the base. Antennae red, or reddish brown, deeper on the upper 

 sides of the joints, first and third joints of nearly equal length, 

 scarcely half as long as the second ; process of second joint of style 

 a little more prominent, and third joint more acuminate than in 

 tibialis. Vertex vai-ying from red to brownish black, bordered in 



