PAUL R. JONES. 281 



Type— Oue female from Meadow, Nebraska, July, 1906 (P. R. 

 Jones). 



This species can be separated from C. macrocera by having darker 

 wings and differently colored pile on the abdomen ; from C. nigra 

 and C. dubia by having darker wings, lighter halteres and differ- 

 ently colored pile on legs ; from C. nigripennis by the difference in 

 the color of the wings, differently colored pile near the ocelli, differ- 

 ently colored pollen on the face, shorter pile on the thorax, and by 

 the abdomen having the fifth and sixth segments clothed as the 

 preceding segments. 



20. ATOHOSIA Macquart. 

 Atomosia glabrata Say. 



One male from Omaha, a female from Haigler, and a female from 

 West Point, Nebraska. Formerly recorded from Pennsylvania and 

 the Atlantic States. 



Atomosia soror Bigot. 



Two males and a female from Harlan Co., Nebraska, which have 

 dense yellow pile on the thorax and abdomen (longer on the thorax). 

 Legs pale yellow. Antennae lighter colored and longer than an- 

 tennae of A. glabrata (especially the third joint). Formerly re- 

 corded from Mexico. 



21. POGOIVOSOMA Eondani. 



Pogonosoma dorsatum Say. 



Specimens from Lincoln and Glen, Sioux Co., Nebraska, August 



and September. 



22. NU.SA Walker. 



Nnsa falTicaiida ? Say. 



One male specimen which I refer to this species, although I have 



some doubts as to its belonging here, and of which I will give a 



description. It answers to Say's description in a general way. 



% . Length 17 mm. Shining blue-black, abdomen with cobalt reflections. 

 Front deeply excavated, ocelli prominent, bisetose. Face somewhat convex 

 below, white poUinose, covered with long white hair, mystax composed of long, 

 stout, black bristles, which extend nearly to the base of the antennse, beard and 

 hair on cheeks long, silky white. Antennae black, first joint nearly twice as long 

 as the second, third about as long as the first two together, dilated at the apex 

 and covered with very short, silky, reddish pile. First and second joints short, 

 white pilose and with long black bristles, those on the under side longer. Inner 

 eye margins opposite the base of the antennte and a little above with a row of 

 black bristles. Thorax shining blue-black, covered with brownish pollen, pile 

 short, black, a few black bristles on the lateral borders and posterior part, two 

 median dark stripes separated by a pollinose stripe and two lateral oblong dark 



TEANS. AM. ENT. SOC. XXXIII. (36) AUGUST, 1907. 



