196 BULLETIN 31, TTXITED STATES NATTOXAL MUSEUM. 



remainder entire; each segment, except the first, with a median subtri- 

 angnlar spot ochraceous poUinose and contiguous with the liind mar- 

 gin ; hind margin of the third segment narrow, of the fourth segment 

 broad, hiteous. Legs hiteons ; front femora near the base with a black 

 spot; hind femora near the base with a minute blackish spot, above in 

 large part black and near the tip on each side with a fuscous spot; hind 

 tibise near the base with a fuscous ring, at the tip blackish fuscous; 

 hind tarsi wholly blackish fuscous. 



Translation of the original, compared with the type specimen at Cam- 

 bridge. 



Helophilus obscurus. 



Heloplnlu8 obscurus Loew, Centur., iv, 74. 



Habitat— Colorado (O. S.)! 



9 . Length, 10™°". Black and yellow varied. Face somewhat project- 

 ing, with the cheeks and a rather broad median stripe black. First 

 two joints of the antennae brownish-black, third joint red, more obscure 

 on the upper portion. Dorsum of thorax with four yellow stripes, the 

 intermediate ones slender. Scutellum yellowish testaceous. Abdo- 

 men black, opaque, the posterior margins of the segments moderately 

 shilling; witli four yellow, interrupted cross-bands, the anterior ones of 

 moderate width, the i)Osterior ones narrow. Femora black, the tip of 

 the front and middle pairs and a subajiical ring on the hind pair lute- 

 ous; front tibiae and tarsi wanting; middle tibiae and meta tarsi hite- 

 ous, remaining joints of the tarsi black ; hind tibiae black, base lute- 

 ous, and a median ring brown, tarsi wholly black. Wings cinereous 

 hyaline, near the costa very dilutely brownish, stigma siibfuscous. 



Translation from the original, compared with the type specimen at 

 Cambridge. A second specimen has the front and middle femora black, 

 except the tip, and their tibiae and tarsi yellow, except that the front 

 tibia^. are brownish in the middle. 



Helophilus obsoletus. 



fTelophihts obsoletus Loew, Centur., iv, 75. 



Habitat. — Hudson's Bay Territory (Lw.)! 



9. Length, 9™"', Two slender stripes of the dorsum of the thorax 

 luteous pollinose, obsolete. Basal margin of the scutellum black. 

 Luteous fasciiB of the abdomen of moderate width, the first broadly, the 

 second narrowly interrupted, the third entire; each segment, except the 

 first, with a posterior luteous margin, and a triangular spot contiguous 

 with it of the same color. Legs luteous, the color of the hind pair darker ; 

 front femora near the base with two minute black spots, hind femora 

 on the posterior side with a large black spot ; hind tibiae near the base 

 with a brownish ring, and at the tip blackish ; hind tarsi wholly black. 

 Pile of the whole body a little longer than in the female of H. integer 

 or laetus. 



Translation from the original, compared with the type specimen at 

 Cambridge. 



