THE CANADIAN ENTOMOLOGIST. 203 



Face slightly, but evenly convex and rather wide, front clothed 

 with silvery dust and white hairs, which are longest and coarsest, and 

 sometimes brownish near the oral margin. Ocellar tubercle rather 

 prominent ; posterior orbits thickly clothed with rather fine white hairs. 

 Antenna black, first two segments with white bristles ; third segment of 

 uniform width, with a short style bearing a small bristle at the tip ; length 

 much in excess of the first two segments together. Thorax clothed with 

 gray dust and furnished with white hairs, which on the disk may have a 

 brownish tinge ; scutellum clothed with gray dust and white hair ; legs 

 black, with white bristles and hairs, hind tibise and tarsi somewhat 

 enlarged and with short golden pile on part of the anterior surface ; wings 

 uniformly very dilute-brownish, so dilute, in fact, that they might well be 

 said to be hyaline. 



Male abdomen shining blue-black, of nearly uniform width throughout 

 its length. Each segment, from one to six on either side, with a distinct 

 white spot on the posterior margin. 



Female abdomen shining blue-black, widest near the middle of its 

 length, each segment, from one to five on either side, vvith a white marking 

 on the posterior margin. These markings are larger and longer than in 

 the other sex. 



Two males and a female from Hope Mountains, B. C., July 19, 1906, 

 and a female from Similkameen, B. C, July 20, 1906. 



There seems to be some uncertainty as to the limits of the genus 



Cophura as used by the different authors, and it is therefore with a certain 



hesitation that I have concluded to place the present species in it, but 



from the standpoint of the recent catalogue by Aldrich, who follows 



Williston, albosetosa may be included. It has affinities with some of the 



species placed in the genus Taracticus, but the abdomen shows no sign of 



punctulation. It is probable that when a critical study of sufficient 



material is possible the limits of Cophura will be restricted. Although 



the insect has a general resemblance to some of the species of Cyrtopogon, 



it does not belong there because of the claw-like spine at the end of each 



front tibia. 



NiGRASiLUS, n. genus. 



Front and face of ordinary width, face widest below. Facial gibbosity 



rather prominent and with numerous bristles. Third segment of the 



antenna rather narrow, and a little longer than the first two together, 



arista only about half as long as its segment. Thorax with bristles on the 



posterior part and several bristles on the margin of the scutellum. Wing 



