276 



ERNEST A. BACK. 



the style thick, pointed at tip, not easily distinguished from the third 

 segment. Scutellum convex, with long black pile. Halteres reddish- 

 yellow. Segments 2-6 of abdomen with posterior white pruinose cross- 

 bands, interrupted in the middle. Legs wholly black, tarsi deep red- 

 dish; the front pair slender, clear honey-yellow. The fore tibiae and 

 tarsi above clothed with short white pile, which is more or less de- 

 pressed, but neither obscuring the ground color nor parted as in 

 callipedilus. In fact, in looking at the fore tarsi without a lens, one 

 notices the yellowish color of the tarsi fully as much as the white pile 

 upon the segments. Hind tarsi darker than the middle tarsi, and 

 the terminal segment of each tarsus is darker; claws broadly yellowish 

 at base; pulvilli pale. The middle tarsi without the ornamental 

 brush found in callipedilus. All the bristles of the tibiae and tarsi 

 black; those on the fore tarsi scant and weaker; the tips of the hind 

 tibias and the under side of their tarsi with golden pubescence. Wings 

 blackish hyaline; darker on the anterior cross- vein, the separation of 

 the second and third longitudinal and at the end of the costal vein; 

 venation normal. 



9 . — The female does not differ from the male, except it is naturally 

 more robust and the pile of the entire body is black except on the 

 anterior pairs of coxae. All the tarsi are similar in appearance, dark 

 reddish; in one specimen the bases of tibiae are reddish. Abdomen 

 less pilose, segments 2-5 with white pruinose posterior cross-bands 

 broadly interrupted. Face and occipital orbits grayish, the front 

 brownish pruinose; thoracic dorsum on anterior two-thirds rather 

 densely yellowish-brown pruinose, grayish on the anterior margin, 

 leaving a distinct geminate stripe well divided by a narrow pruinose 

 stripe which extends backward clear to the scutellum, widening before 

 reaching it. The humeri and a large spot anterior to the transverse 

 suture subshining, distinct; dorsum on posterior third nearly devoid 

 of bloom; scutellum thinly, the pleurae more densely, grayish pruinose. 

 The stripes and spots of dorsum are best seen from before. Wings as 

 in male, only darker from the anterior cross-vein to the end of the 

 costal vein. 



Type. — Described from two male and three female spec- 

 imens; one male and one female co-type deposited in the 

 collection of the Massachusetts Agricultural College, and one 

 male and two female co-types in that of the Montana Agri- 

 cultural College. 



Habitat.— All from Gallatin Co., Mont., elev. 8,000-9,400 

 feet; (July 9-11, E. Kock). 



