THE CANADIAN ENTOMOLOGIST. V2l 



Arista long, basal, brown, very indistinctly pubescent. Thorax shining 

 blackish-blue, short black pilose. Scutellum with slender bristles on the 

 margin. Abdomen oval, wider than the thorax, everywhere shining dark 

 blue, almost bare. On the dorsum of the abdomen the pile is black, on 

 the margins, especially anteriorly, it is white, and on the sides of the second 

 segment rather long. Legs black, knees and narrow base of the tibiiw 

 only lighter, short black pilose. Wings hyaline, the stigma and all the 

 veins light luteous. L. corp. 8 mm., L. al. 8 mm. 



One specimen : Cook's Inlet, Alaska ; Prof. L. L. Dyche, of the Uni- 

 versity of Kansas. 



5. Cliilosia plutonia, n. sp. Plate V., Fig. 7, 9. 



Allied to C. Willistoni. Ryes bare, arista plumose, scutellum with 

 bristles, legs black, second and third abdominal segments opaque exxept 

 the anterior corners, thorax long black pilose, wings very dark. 



Male. — Frontal triangle swollen, but little shining, long black pilose. 

 Ocellar area similarly pilose. Face not pilose, very slightly poUinose, 

 gently concave to the tip of tubercle which is round and distinct, thence 

 only very slightly concave to the tip of the epistoma ; but little produced 

 below the eye. Occiput long white pilose below. Antenn* small, black; 

 third joint yellowish-red, a trifle longer than broad, rectangular with the 

 lower basal corner bulging slightly outwardly. Dorsum of thorax and 

 pleura subshining, long, erect, black (in all lights) pilose, finely punctured. 

 Scutellum shining, quite distinctly punctured with bristles and coarse hairs 

 on the margins. Abdomen not wider than the thorax, opaq\ie. There 

 are shining brassy triangles on the anterior angles of the second and third 

 segments ; these spots extend about one-half of the width of the segment 

 laterally and about the same distance inwardly. On the fourth segment 

 there is a complete anterior shining band of metallic. Pile of abdomen 

 sparse, long on the lateral margins, on the opaque portions black, on the 

 shining portions whitish. Hypopygium shining, white pilose. Legs en- 

 tirely black, long black pilose ; on the anterior and middle femora the 

 pile is long and slender, forming loose cilia, on the inner side of the pos- 

 terior femora it is short and spinous. Wings very dark, especially before 

 the anterior cross vein. L. corp. 85^ mm., al. 8 mm. 



In some lights the fourth abdominal segment seems almost entirely 

 shining, and the anterior and middle legs seem whitish pilose. 



One specimen ; Cook's Inlet, x\laska ^ Prof. L. 1^. Dyche, 



