134 THE CANADIAN ENTOMOLOGIST. 



error in the description, and there is no yellow posterior margin on the 

 second and third abdominal segments. The pile of the median segments 

 may be yellow, or mixed with black, or chiefly black. In the female the 

 third and fourth segments are covered with dense deep black pile, and 

 there is no posterior opaque margin on the third or else a very narrow 

 one. This species has elsewhere been recorded only from the State of 

 Washington. [VVilliston.] 



23. Eristalis iiioiilaiii/s, ^Vill. 



Several specimens of this species were taken during July on the Pine 

 Ridge in North-western Nebraska. They all have the black on the 

 second abdominal segment as broad on the posterior margin as on the 

 anterior; some of them have an indication of an- opaque cross band on 

 the posterior part of the third, and in others the posterior part is entirely 

 shining. The pile of the eyes is entire. 



These specimens were captured hovering over a small, shallow pond, 

 at an elevation of a trifle over 4,000 feet. 



24. Helophiliis lafifarsis, n. sp. 



Male. — Antennie black ; arista yellowish at the base. A spot direct- 

 ly above the antenna:;, a broad facial stripe ending abruptly before the 

 base of the antennas ; cheeks and narrow oral margin shining black, the 

 facial stripe may be more brownish. Front, except the vertex which is 

 opaque black and black pilose, and face densely yellowish pollinose and 

 yellow pilose. Face in profile not at all conically produced below, 

 gently concave below the antennge to half way to the epistoma, thence 

 perpendicular to the notched epistoma. Lower border of cheeks forms 

 with the plane of the occiput only a very little more than a right angle. 

 Dorsum of the thorax opaque black, everywhere short yellow pilose, com- 

 plete lateral margins yellow, two median moderately broad uninterrupted 

 silvery white stripes which reach the scutellum. Scutellum entirely 

 testaceous pile black, on the very narrow posterior and anterior margins 

 yellow. Abdomen, first segment opaque black, the extreme angles yellow. 

 Second segment opaque with a very narrow posterior margin shining, 

 bright yellow with a broad central stripe of deep opaque black not reach- 

 ing posterior border and expanded on the anterior border so as to cover 

 three-fourths of the width of the segment ; posterior band ferruginous, 

 very narrow at the lateral angles and increasing in width to the centre of 

 the segment, where it unites with the central stripe ; pile short, yellow 

 except on the posterior margin. Third segment yellow, tinged with red- 



