﻿SOME ALASKAN SYRPHID FLIES — FLUKE 49 



Another female, from Oregon, differs in darker antennae, darker 

 legs, more pollinose mesonotum, and paler pile on the face. 



The females of all these species will be diiSicult to characterize until 

 a good series, along with their respective males, has been collected. 



CHRYSOGASTER (BARBERIELLA) NIGRIPENNIS (Williston) 



Figure 10, Ji, q 



Chilosia nigripennis "Williston, Synopsis of tlie North American Syrpliidae, 

 p. 44, 1SS6. 



Male. — Length about 7 mm. Front without long hairs but with a 

 band of very fine pile next to the eyes. Kough area on the sides of 

 the face very distinct, pile rather conspicuous and all black, paler 

 on the cheeks. Downward-projecting pile on the rim of the scutellum 

 yellowish. Wings smoky brown. Styles on the genitalia without 

 a notch at apex and about four times longer than narrowest part ; one 

 hook of the ejaculatory hood blunt, other sharp. I do not believe 

 this one hook was broken, although that is a possibility. The speci- 

 men studied is one from Mount Jefferson, Oreg., July 15, 1907 (Brid- 

 well). It was compared with the type at Washington. This species 

 and chUosioides are very similar in general appearance but the geni- 

 talia of the latter are more like versipellis. 



HELOPHILUS NEOAFFINIS, new species 



Figure 11, a, 6, c, ; 



Related to and very much like affinis Wahlberg, differing mainly in 

 the genitalia. 



Male. — Length 12 to 14 mm. Face and front yellow with golden 

 pollen and yellow pile ; face with a broad median shining black stripe, 

 which is wider below and which disappears above at the bottom of 

 the rather deep concavity on the upper third; a broad shining area 

 between the slopes of the face and the grayish pollinose cheeks; the 

 sides of the mouth also shining black. Front relatively wide, the pol- 

 linose area above the depression about as broad as long, a V-shaped 

 shining black area on the antennal prominence. Ocellar area velvety 

 black ; pile black across the ocelli ; occipital pile yellow becoming white 

 below, a few black cilia above, but they are quite short. Antennae 

 black, the third segment brownish black, arista yellow. 



Mesonotum opaque black with two golden vittae that are slightly 

 wider both anteriorly and posteriorly ; sides broadly golden pollinose ; 

 the pile all yellow. Scutellum yellow with yellow pile, strongly black 

 across the disc. Pleura black, lightly grayish pollinose, the pile 

 yellow. 



Legs black with the following yellowish areas : Apical one-fourth 

 to one-third of the fore- and midfemora, basal third of the hind tibiae, 

 all of the fore- and midtibiae, the foretarsi, the basal two segments 



