340 GEO. H. HORN, M. D. 



surface finely striate, stria; feebly punctured, intervals flat, densely punctulato, 

 and finely cinereo- pubescent. Pygidium broadly oval, feebly convex, coarsely 

 punctured and sparsely pubescent. Body beneath black, sparsely pubescent. 

 Anterior and middle tibiae pale rufous, femora piceous, hind legs black 

 Length .10 inch; 2.5 mm. 



Closely resembling B. calvus, but more regularly elongate oval in 

 form, with smaller scutellum and with pale front legs. 



One specimen from Mr. C. V. Riley, who obtained it from the 

 Schrankia uncinata, near St. Louis, Missouri. 



B. aiircolllS (see preceding group). — The form here noted in the synoptic 

 table corresponds with the larger and more fully developed forms of JB. pau- 

 perculus, also of the preceding group, and are merely noticed in this place be- 

 cause many of the specimens have two very distinct denticles and might be 

 supposed to be undescribed, in the absence of the smaller form. 

 Occurs in Owen's Valley on the flowers of Astragalus. 



B. liiixSuS. n. sp. — Resembles the preceding in form and sculpture and 

 di Hers as follows: — Thoracic pubescence oehreous, becoming cinereous at the 

 sides and with a minute whitish spot on each side of the middle and median 

 line whitish. Scutellum elongate oval, pubescence white. Elytra with oehre- 

 ous pubescence slightly shaded with cinereous and with a short white line on 

 the third interval. Legs pale rufous, hind femur at base and last two tarsal 

 joints piceous. Length .OS inch; 2 mm. 



Collected in Utah. 



Group VIII. 

 The hind thighs in this group have a strong tooth, usually rather 

 long and acute, and three denticles also longer than usual placed at a 

 moderate distance from the tooth. We have in our fauna three 

 species of which two have stout femora closely resembling those of B. 

 mimus. 



B. miisculus. Say, Cure, p. 3; Am. Ent. Ed. Lee. i., p. 261. — Black 

 moderately robust, clothed with cinereous hair. Head black, coarsely punc- 

 tured, sparsely pubescent. Eyes very deeply divided. Antenna; longer than 

 head and thorax, gradually thicker to tip, frequently entirely pale rufous, usu- 

 ally with joints 6 — 10 piceous, terminal joint always rufous. Thorax wider at 

 base than long, sub-campanulate, rapidly narrowing from base to apex, base 

 moderately lobed at middle, on each side slightly sinuate, coarsely and 

 densely punctured and sparsely pubescent. Scutellum sub-quadrate with 

 whitish pubescence. Elytra sub-quadrate, disc flattened, rather deeply striate, 

 strise punctured, intervals flat, densely punctulate, cinereo-pubescent, the 

 third interval behind the middle with a more evident whitish line. Pygidium 

 triangular, coarsely punctured, sparsely cinereo-pubescent, more distinct along 

 the middle. Body beneath black, finely punctured and sparsely pubescent. 

 Legs testaceous, middle femur to middle, and hind femur and tibise entirely 

 piceous. Length .C8 — 10 inch; 2 — 2.5 mm. 



Resembles B. mimus in form, but abundantly distinct by the char- 



