THE CANADIAN ENTOMOLOGIST. 137 



The female scarcely differs. There is an indication of a gray lateral 

 stripe on the mesonotum at the humeri. The species is closely related to 

 H. g>-oenlandicHS, Stteger, but differs in tlie extent of the shining colour of 

 the abdomen, the absence of the poUinose spots on the abdomen, and the 

 colour of the pile of the mesonotum and abdomen in part. There are no 

 yellow markings whatever on the fourth abdominal segment. 



Four specimens : Sitka, Alaska ; Prof. L. L. Dyche. 



The above description is Williston's. The manuscript containing it 

 was most generously turned over to me by Dr. VVilliston, with the 

 permission to change it in any manner I might see fit. I have not found 

 any change or addition to be necessary. 



26. Helophibis mexkatius, Mcq. 



I have a specimen of this species from Custer in the centre of the 

 black hills in South Dakota. The description applies exactly. This 

 species has not previously been recorded except in Mexico and on 

 the Pacific Coast. 



27. Helophilus pilosus, n. sp. 



Female. — Pile everywhere, including the face, long and rather 

 abundant. Antennae reddish-yellow. Front opaque black, clothed 

 with yellow pollen on the lower half or more, everywhere black pilose. 

 Face entirely yellow, rather deeply concave below the antennae, thence 

 almost perpendicular, produced downwards so as to form a short, regular, 

 sharply-pointed cone. Cheeks black, their lower border forming with the 

 plane of the occiput a very obtuse angle. Dorsum of the thorax opaque 

 black, with four broad, complete yellowish-white stripes, the central black 

 interval without whitish line ; pile short yellow. Scutellum yellow, with a 

 blackish cast ; apical margin more yellowish, pile yellow. Abdomen a 

 trifle broader than the thorax, the sides almost parallel, pile everywhere 

 yellow, short except on the margins of the second segment. First seg- 

 ment whitish pollinose, a rather large spot on each side yellow. Second 

 segment opaque, the posterior margin shining black, on each side with an 

 L-shaped spot of yellow extending three-fourths of the width of the 

 segment, their inner side concave ; these spots leave a very broad interval 

 of black between them. Third segment with a broader posterior margin 

 of shining, with two small arcuate spots beginning at the anterior angles, 

 not approaching each other, of yellowish pollinose. Fourth segment 

 shining on tlie apical lialf, with two similar Init almost straight spots 

 separated at their inner ends by only as much as their width. Fifth 



