SYNOPSIS OF NORTH AMERICAN SYRPHID^. 193 



shining" black on the tubercle and below along the mouth, on the sides 

 above with yellowish dust and pile. Cheeks below the eyes moderately 

 broad, whitish dusted. Dorsum of thorax nearly bare, opaque black, 

 shining- on the sides, in the middle with a slender, on each side with a 

 broader grayish-olivaceous stripe, a little broader than the intervening 

 black space, all confluent in front of the scutellum. Pleurae grayish pol- 

 linose. Scutellum yellowish-red on the margin and with yellowish pile. ^ 

 Abdomen oval, shorter than the wings, wholly black, except a narrow 

 yellow hind border on the last segments; shining; in the female on the 

 sides of the first segment, second segment along the base and extending 

 back narrowly in the middle to nearly the hind border, opaque black, 

 narrowed on the sides as though by an interrupted cross-band ; in the 

 male the first segment, except the sides, the second segment, except the 

 lateral and ]>osterior margins (on the sides in the middle and behind 

 more broadly), and the third segment with a large triangle in front, its 

 apex near the hind margin, and nearly truncated by a slender interrupted 

 cross-band, opaque black. Legs black ; the distal end of all the femora 

 (the hind femora at the tip above, however, black), and narrow base of 

 all the tibire and a rather broad ring near middle of hind tibise, yellow ; 

 sometimes rings near the middle of front and middle tibise less distinctly 

 yellow. Wings faintly tinged with blackish. 



Three male and one female specimens from Como, Wyoming (alt. 

 7,000 feet), June 20. 



Helophilus conostomus, u. sp. (Plate VIII, fig. 3.) 

 ? Helophilus titipatns Walker, List, etc., iii, 602. 

 / UelophiUiit Anatisis Walker, List, etc., iii, 603. 

 HelophUiis lineatm Osten Sackeu (uon Fabr.), Cat. Dipt., 134. 



Habitat. — Connecticut!, Massachusetts, Illinois, Canada (O. S.). 



S ,9 . Length, 8 to 9°*°^. Front yellowish-brown, above the antennae 

 more yellow ; pile black, more yellowish above and below. First two 

 joints of the antenucTe blackish-brown, third joint reddish-brown or red. 

 Face light yellow, with similar colored pollen, concave for a short dis- 

 tance below the antennae, and then nearly straight to the tip, the lower 

 part of the face much produced downward and forward into a slender 

 nearly regular cone, pointed at the tip. Cheeks black, extending more 

 narrowly along the oral margin to the tip. Dorsum of thorax opaque 

 black, with a broader, lateral, grayish poUinose stripe and two narrow 

 dorsal ones, linear in the male; a little broader in the female, and ex- 

 panded in front of the scutellum so as to touch each other at the tips. 

 Pleural thickly dusted like the dorsal stripes. Scutellum brownish-yel- 

 low or yellowish, translucent, usually more or less black along the base; 

 pile, like that of the thorax, grayish-yellow. Abdomen black, with yellow 

 and grayish pollinose markings. In the male the first segment opaque, 

 except the lateral margins ; second segment with a large yellow spot 

 on the sides, extending from the anterior angles nearly to the posterior 

 part, inclosing the opaque in the shape of a goblet, of which the stem 

 is short, square, and rectangular, the base forming a narrow complete 



