﻿48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



tubercle and epistoma, the pile rather long. Antennae entirely black, 

 third segment nearly as broad as long; pile on the second segment 

 with two or three hairs above longer than the third segment; arista 

 with basal segment, pubescent. 



Mesonotum semishining, black, with three faint grayish pollinose 

 vittae in front that are visible only in certain lights. Squamae light 

 brown with darker fringe, halteres orange yellow. Wings somewhat 

 smoky, veins black, the stigma elongate and dark. 



Abdomen generally opaque on the discs of the tergites, shining on 

 the sides and entirely shining on the fourth segment and beyond. 

 Genitalia large, the styles very long and slender, the ejaculatory hood 

 in the shape of closed ice-tongs. 



Female. — There is little to add to Shannon's description. Most of 

 the females I have seen in this group are teneral and that applies to 

 the four specimens at hand. 



Allotype (male by present designation). — Umiat, Alaska, June 24, 

 1947, K. L. Knight, collector; paratype male same data and four 

 females, homeotypes, same data, one without abdomen. 



CHRYSOGASTER (BARBERIELLA) VERSIPELLIS (Williston) 



FiGXIEE 10, W, 



Chilosia versipellis Williston, Synopsis of North American Syrphidae, p. 44, 



1S86. 

 Chrysogaster (Barberiella) nigripennis Shannon (nee Williston), Ins. Insc. 



Menstr., vol. 10, p. 123, 1922. 



Mule. — Front strongly swollen, with a faint depression, bare im- 

 mediately above the antennae, but with numerous long black hairs 

 along the eye margins. Facial tubercle weak with only a gentle swell- 

 ing. Face and front polished, highly shining. Basal segments of the 

 antennae black, the third orange, arista missing. 



Scutellar pile all black including the downward-projecting hairs, 

 which are short. Wing veins and membrane decidedly yellow; hal- 

 teres orange-yellow. 



Female. — The following short description is of a female that I 

 place here with some doubt. The face and front highly polished, 

 only lightly pollinose in a band below the antennae; facial, frontal, 

 and occipital pile short and black ; white on the cheeks. Mesonotum 

 lightly brownish pollinose with short yellowish brown pile ; scutellar 

 pile brown with longer bristlelike hairs irregularly placed along the 

 margin, the downward-hanging hairs not very evident on this speci- 

 men. 



Legs black, the tarsi yellowish orange. Wings decidedly brown- 

 ish; squamae light brown, halteres orange. Angora, Lake Tahoe, 

 Calif., July 11, 1915, E. P. Van Duzee collector. 



