334 GEO. H. HORN, M. D. 



wide at base, trapezoidal, sides nearly straight, slightly rounded near 

 the front angles and with a fine impressed line parallel with the anterior 

 margin not extending along the upper surface ; base feebly lobed at middle, on 

 each side slightly sinuate; surface sparsely punctured and clothed with yel- 

 lowish-white pubescence with a fine line of white along the middle. Scutel- 

 lum twice longer than wide, with distinct median line, pubescence white. 

 Elytra at base not wider than the thorax, rather rapidly widening with sides 

 arcuate, surface finely striate, strife finely punctured and rather deeper at base; 

 intervals flat, densely and finely punctulate, and densely clothed with pubes- 

 cence of an uniform dirty white color. Pygidiura broadly oval, sparsely punc- 

 tured and clothed similarly to the elytra. Body beneath piceo-rufous, abdo- 

 men rufous., sparsely whitish pubescent. Legs pale rufous. Length .20 inch ; 

 5 mm. 



The humeri are frequently tipped with piceous. This species is 

 one of the largest of the group, and is a reproduction on a large scale 

 of B. desertorum of the preceding group. 



Deserts of the Colorado and Gila Rivers of California and Arizona. 



B. bisignaftBS, n. sp. — Oblong oval, black, elytra rufous with humeral 

 and large lateral spot at middle, piceous. Head black, opaque, finely punctu- 

 late, front finely carinate. Antennae as long as head and thorax, black, basal 

 four joints rufous, subserrate. Thorax broader at base than long, sides strongly 

 arcuate in front, at base feebly sinuate; base feebly lobed at middle; surface 

 coarsely punctured and sparsely clothed with brownish hair varied with a 

 whitish patch in front of scutellum, a small space on each side of middle and a 

 very white small patch at the middle of each side. Scutellum subquadrate, 

 median line distinct, clothed with whitish pubescence. Elytra at base not 

 wider than the thorax, sides feebly arcuate, surface striate, striae finely punc- 

 tured, interspaces very finely punctulate; color rufous with humeral piceous 

 spot extending, by a narrow band, along the margin to the middle and ending 

 in a moderately large spot of acutely oval form which extends inwards to the 

 fifth or fourth stria, inner apical angle also narrowly piceous; surface clothed 

 with yellowish-white pubescence, paler along the third interval and behind 

 the lateral spot; pale pubescence of third interval thrice interrupted by brown- 

 ish spaces. Pygidium oval, sparsely punctulate, clothed with yellowish-white 

 pubescence, paler at the sides. Body beneath black, moderately shining, 

 sparsely punctulate, and pubescent with white. Legs pale rufous, middle and 

 hind femora piceous at base. Length .08 inch ; 2 mm. 



Easily known from all other species of this group, with the elytra of 

 varied color, by the entirely black under surface. 



Three specimens from Kansas. 



B. alboscutellatus, n. sp. — Oblong oval, moderately robust, black, 

 sparsely cinereo-pubescent, pubescence of the intervals interrupted. Scutel- 

 lum round, conspicuous, densely clothed with white pubescence. Head black 

 opaque, densely punctulate. Antennae longer than head and thorax, sub-ser- 

 rate, black, four basal joints somewhat paler. Thorax broader than long, sides 

 feebly arcuate and scarcely narrower in front; base feebly lobed at middle, on 

 each side sinuate; surface coarsely punctured, very sparsely whitish pubes- 



