320 ERNEST A. BACK. 



Heteropogou jolmsoiii (PL X, fig. 4.) 



Anispogon johnsoni Back, Can. Ent., XXXVI, 293, 1904. 

 (^ Q. — Length 10-12 mm. — -Black; head, thorax, scutellum, poster- 

 ior margins of abdominal segments, venter and legs with dull yellowish- 

 white or whitish pile. Pile, except on the posterior margins of the 

 abdominal segments, where it is short, recumbent and often deeper 

 yellow than on the thorax, long, erect, not dense, giving the insect a 

 furry appearance. Face, thinly white pruinose; mystax composed of 

 long, dense, black pile on the oral margin, above not as dense, yellow- 

 ish-white, and extending upward to the antennas on either side of the 

 face in such a way as to leave the middle of the face below the antennae 

 bare. Occiput white pruinose, with long pile; in one male specimen 

 with a few black bristles. Beard long and fine; palpi small, with 

 black and white pile; proboscis and antennae black, style of the latter 

 nearly or quite as long as the third segment. Thorax in several spec- 

 imens slightly white pruinose beneath the long pile. Abdominal 

 segments finely punctate, the anterior two-thirds of each segment 

 with short black pile, not easily noticeable. Last two segments of 

 the female polished black, not punctate; genitalia of male small, 

 reddish, with fine pile. Coxae and femora black, with the same long 

 pile of the thorax; in the male there is a small patch of short black 

 pile on the upper- distal portion of the middle and hind femora; tibias 

 and tarsi vary from nearly black to deep testaceous. The pile and 

 bristles of the tibis moderately long and whitish; the bristles of the 

 hind pair in part black; the middle pair without the brush found in 

 ludius or senilis. The front metatarsi clothed with sordid white, 

 appressed, but not very dense, pile; this same pile is found in less 

 degree on the other metatarsi, but there is usually confined to the 

 basal half; bristles of the remaining tarsal segments, with the excep- 

 tion of one or two on the second segment black. Claws black; pulvilli 

 dark brown. Wings hyaline; veins yellow. 



Types. — Three pairs of co-types deposited one each in the 

 collections of the Mass. Agr'l College, Prof. C. W. Johnson, 

 and the American Ent. Soc. of Phila. Ten paratypes, eight 

 of which are in the collection of the Am. Ent. Soc, and two in 

 my own collection. 



//a6;7a^.— Colorado ; Fort Collins, Col. (Sept. 12, 1901). 



I have placed this species under Heteropogon because it does 

 not possess those dense tufts of pile on the sides and venter 

 of the abdominal segments which I consider fully as charac- 

 teristic of Pycnopogon as the shape of the abdomen. 



