THE CANADIAN ENTOMOLOGIST 



337 



Fig. 17.- —  Lasiosina canadensis 

 head of male, side v:tw 



I am indebted to Mr. Chas. T. Greene for making comparisons 

 with the latter, from which I conclude that it is a distinct species. 



Lasiosina canadensis, n. sp. (Figs. 17, 18, 19). 



Front more than half the head-width, flat, somewhat project- 

 ing over antennae, pale yellow in colour, with the following pairs 



of bristles, large for the family: 3 and 

 sometimes 4 fronto-orbitals ; 1 divergent 

 ocellar; 1 convergent post-vertical or 

 post-ocellar; 1 inner vertical, strongly 

 convergent, just outside the hind angle 

 of triangle; 1 outer vertical, strongly 

 divergent, on a slight swelling farther 

 back than preceding; there are also 40 

 or 50 small black hairs, mostly on the 

 anterior half of front, of which one or 

 twt) pairs near the median line may be a little larger. Triangle 

 distinct, of moderate size, its sides convex, the apex drawn out 

 in a slender point which almost reaches the extreme anterior edge 

 of the front; ocellar dot black, connecting with black of occiput, 

 rest of triangle dark yellow to brown, subshining, often with 

 darker margin. Face and bucca light yellow, the latter over 

 half the eye-height; eye strikingly elon- 

 gated lengthwise of the head; antennae of 

 moderate size, ^^ellow, in the female the 

 third joint wholly infuscated, in the male 

 it is largely or wholly yellow, the in- 

 fuscation usually confined to a spot at 

 base of arista; the latter black, bare, 

 Palpi yellow in male, distinctly brown in 

 female. A pair of small, pale vibrissal 

 hairs. Back of head yellow except cen- 

 trally and directly behind the posterior curve of eye. 



Thorax opaque yellow to reddish, the notum with three broad 

 opaque black stripes, the middle one narrowed or abbreviated be- 

 hind, lateral ones distinctly shortened in front, not connected with 

 the dark of humeri; scutellum yellow, its sides blackish; post- 

 notum dull black; pleurae with a shining black spot on lower edge 



Fig. 18. — Same from above. 



