AMERICAN COLEOPTERA. 229 



\ 



Lake Superior, four specimens. Differs from B. amnilaris by the 

 more strongly and densely granulated head and prothorax ; the latter 

 is wider and more rounded on the side's, with the hind angles rounded 

 and indistinct. 



28. 15. rii(ic>oriii$«, Lee. New Spec. Col. (Smithsonian 8vo), 5.3. — Blackish- 

 brown, base of antennpe and legs yellow-brown; elytra usually yellow-brown, 

 more densely and finely punctured than in the allied species. Head opake, 

 densely granulated, frontal suture distinct, occipital fovea and transverse line 

 small; feebly and sparsely punctured behind. Prothorax wider than long, 

 rounded on the sides, hind angles obtuse but distinct; disc densely granu- 

 lated, opake, distinctly but not strongly punctured, dorsal line fine. Elytra 

 less convex than in the allied species, and more finely and densely punc- 

 tured. Dorsal segments sparsely punctulate, ventrals strongly but finely and 

 rather densely punctured. Flanks of prothorax concave behind, but less so, 

 and nearly flat in front, episterua rather wide. Mentum feebly imj)ressed. 

 Length 3 mm ; .12 inch. 



%. — Eighth ventral with a deep acute triangular impression. 



San Mateo and San Bernardino, Gala.; many specimens. This 

 species closely resembles B. laticoUis, and differs only by the sexual 

 characters, the elytra more finely punctured, and by the hind angles 

 of the pruthorax being distinct, and not entirely obliterated. Speci- 

 mens collected by Dr. Horn in South-eastern Calif'oiuia, are inter- 

 mediate in these characters and indicate that one of these species 

 might have developed from the other at a recent geological time. 



29. B. (livistlS, Lee. New Spec. Col. (Smithsonian 8vo), 5.3.— Black, head 

 and prothorax nearly opake, and very finely granulated, antennae and legs 

 piceous, tibiae and tarsi paler. Head flat, feebly punctulate. Prothorax a little 

 wider than long, sides rounded, hind angles obtuse, distinct; disc finely not 

 densely punctured, dorsal line fine. Elytra yellow, with the sides and a laro-e 

 common triangular space from the humeri to the tip of the suture black: 

 rather strongly and densely punctured. Dorsal segments shining, spnrsely 

 punctured, ventrals finely and densely punctured. Side margin of prothorax 

 acute, groove of the side deep, narrow, episterna narrow. Length 3 mm; 

 .12 inch. 



%. — Eighth ventral segment acutely and deeply incised; 9 with the same 

 segment rounded at tip and slightly impressed. 

 Kansas, Lake Superior and Canada. 



30. B. I>lciiralif«, n. sp.— Similar in all characters to B. divisus, except 

 that the yellow part of the elytra is defined by a curved instead of a straight 

 line, so that the common triangular spot noted in that species becomes a broad 

 sutural stripe, rounded behind and expanded in front, so as to occupy the base. 

 Length 3 mm; .12 inch. 



%. — Eighth ventral segment longitudinally impressed; 9 not impressed. 

 San Bernardino and Stockton, Cala. ; Mr. Crotch; several speci- 

 mens all more or less mutilated. 



TRANS. AMER. ENT. SCO. VI. (31) OCTOBER 1877. 



