126 THE CANADIAN ENTOMOLOGIST. 



6. Chilosia Aldrichi, Hunter. Plate V., Fig. 8, a. 



Several additional specimens have been received from the same 

 locality as the type, Idaho. 



7. Chilosia p-aci/is, n. s\), Plate V., Fig. 3. 



Eyes bare, arista plumose, scutellum with bristles on the margin, legs 

 black. 



Female. — Shining black, somewhat greenish, almost bare. Antennas 

 of moderate size, first and second joints piceous, third bright reddish- 

 yellow, somewhat longer than broad, elliptical ; arista black, basal, long 

 loose plumose. Front plane, short luteous pilose, longer black pilose 

 near the ocelli. Face and cheeks bare, shining, lower anterior orbits 

 very short white pilose. Face considerably obliquely produced below, 

 with a conspicuous round tubercle below the middle moderately concave 

 above ; between the tubercle and the tip of the epistoma there is a short 

 deep concavity. Occiput v/hite pilose. Dorsum of thorax shining, 

 distinctly punctured, very short black pilose in the middle and yellow 

 pilose around the margins, quite widely so anteriorly. Pleura more 

 olivaceous than the dorsum, shining. Scutellum with two apical and 

 three shorter lateral bristles on each side. Abdomen everywhere shining 

 with a greenish tinge, much broader than the thorax at the apex of the 

 second segment, with short white pile that appears to be arranged in 

 bands on the segments ; the lateral margins of the first, second and third 

 segments have longer erect pile. Legs entirely black, the knees, espe- 

 cially the anterior pair, lighter ; the pile is very short, sparse, and in 

 most lights white. Wings uniformly grayish hyaline, veins black. 

 Tegulge white, fringed with somewhat yellowish. L. corp. 6 mm.; al. 

 6^ mm. 



One female specimen : Cook's Inlet, Alaska, 1896 ; Prof. L. L. 

 Dyche, of the University of Kansas. 



This species is very closely allied to C. IVi/iistoni. It differs, how- 

 ever, as follows : The tubercle is much more distinct, and between it 

 and the tip of the epistoma there is a short deep concavity. In IVi/iis- 

 toni the tubercle is so indistinct that between it and the epistoma the 

 outline is almost perpendicular. The face is produced quite distinctly, 

 more downwardly in this species. The pile of the dorsum is black ; in 

 WiUistoiii it is luteous. The pile of the abdomen is also much more 

 sparse and finer ; in Willistoni it is quite uniform and not arranged in 

 bands. 



