AMERICAN DIPTERA. 61 



LEPTID^. 



18. Artliropeas n. sp. ? 



Hill City, So. Dakota (Titus Ulke) ; one female specimen. Length 

 15 mm. 



It differs from Loew's description of the same sex of ^. americana 

 in its larger size, in having the front entirely black, and in the wings 

 being fulvescent without black design, except subfuscous clouds along 

 the veins. 



In the left wing of this specimen there is a well formed extra cross- 

 vein behind the discal cell, exactly opposite to the small cross-vein 

 and of almost the same length. It cuts off the inner corner of the 

 fourth posterior cell where it joins the second basal, thus making 

 the fourth posterior cell five-sided and forming a small triangular 

 sixth posterior cell immediately at the extremity of the second basal. 



C^ONOPID^E. 



19. Couops bracliyrliynclius Mcq. 



Las Cruces, N. Mex., June 18-25 ; two males and one female. 

 Length 71-9 mm. These agree very well with Williston's description 

 of obscuripennis, which is a synonym (ace. to Willist.). In addition 

 t(j the golden yellow markings of the thorax mentioned by Williston, 

 there is an indistinct prescutellar band of that color which, however, 

 is obsolete in one male specimen. The whole of fifth and sixth seg- 

 ments is brassy yellow dusted, and sometimes even the fourth appears 

 wholly so in certain lights. The yellow on tip of second and begin- 

 ning of third segments is more or less silvery white jwllinose. 



20. Conops froiito Willist. 



Las Cruces, N. Mex., June 8 and 25 ; one male and one female. 

 Length 8.5-10 mm. ; silvery lustre distinctly defined on sides of face ; 

 disc of first, third, fourth and fifth abdominal segments more or less 

 black ; the black of fourth, and of fifth especially, being an anterior 

 border ; otherwise agrees perfectly with Williston's description. 



21. Couops gracilis Will. 



Las Cruces, N. Mex., June 15-28 ; three females and five females. 

 Length 9-11 mm. Two of the females and four of the males have 

 the front pure yellow, with hardly a trace of the brown in the mid- 

 dle. The vertex is yellow in most of the specimens ; facial grooves 

 are brownish in middle at the furcation in one male and one female. 

 The males have none, or more or less, blackish on first, fourth and 



TRANS. AM. ENT. SOC. XXII. MAECH, 1895. 



