200 ERNEST A. BACK. 



The antennae of morosus are black, but in the male the third seginent 

 is red to some extent on the end; the antennal style is proportionately 

 long. Mystax whitish-yellow, in its upper portion usually, and some- 

 times in its outer border, with a few black hairs. Bristles of occiput 

 on the upper half more yellowish-white, on the lower half purer white. 

 The humeral callosities red or reddish-brown with black bristles; of 

 the bristles of the posterior third of the thoracic dorsum, the anterior 

 ones are black, the posterior ones yellowish-white; of the bristles 

 located on the lateral margins of the thorax, sometimes the black, 

 sometimes the lighter ones prevail. The abdomen of one male is 

 without perceptible black; in two the hypopygium and last abdominal 

 segment are red, and in the third the red color is spread clear over the 

 last segment. The very bright red fascia on the abdomen of the 

 female sometimes appears as a dark spot. The wings in both sexes 

 are entirely uniformly blackish-gray. The fourth posterior cell is 

 often comparatively wide. 



Type).—U. C. Z. 



Habitai.~Red River of the North, Mmn. 



There are twenty-five specimens of a Stenopogon at the 

 M. C. Z. taken at Yakima R., Washington, June 30 — July 8, 

 which I beheve are morosus. They are all large, generally 

 black; the polished ground color showing through the ex- 

 tremely thin coating of grayish bloom, which along the sutures 

 of the thoracic dorsum and on the pleurae is denser. In some 

 the abdomen is wholly black, in others there is only a faint 

 suggestion of reddish color along the posterior margins of the 

 segments, while in still others the upper side of the whole 

 abdomen is reddish in varying degrees, and in six specimens 

 the entire abdomen is yellowish-red except on the lateral mar- 

 gins of the segments. The venter may be reddish or black. 

 The hypopleurse is wholly bare; the sternopleura bears a 

 small amount of rather long pile, but not such a pronounced 

 tuft as in hreviusculus , jubatus or gratus. 



I suspect that ntodestus and morosus are the same. Care- 

 fully collected and labeled material, however, is necessary to 

 determine this point. 



Stenopogoii niortestus (PI. Ill, fig. 4). 



Stenopogon modestus Loew, Cent., VII, 46, 1866. 

 . $. — Length 26-28.5 mm. — Translation. — Grayish; mystax, beard 

 and thoraic bristles straw-colored; legs grayish-black; knees and tarsi 

 brown; wings equally fuscous. 



