AMERICAN COLEOPTERA. 319 



B. sordidns, n. sp. — Short, robust, black, opaque, sparsely clothed with 

 dark cinereous or ochreous pubescence. Scutelhun white. Pygidium and 

 undersurface clothed evenly with whitish pubescence. Head black, scarcely 

 pubescent, densely punctured, front not carinate. Antennae pale rufous, outer 

 joints slightly darker, feebly sub-serrate. Thorax one and a half times broader 

 at base than long, sides strongly arcuate, base trisinuate, median lobe moder- 

 ate, feebly emarginate, surface moderately convex, densely and evenly punctu- 

 late, punctures much coarser near the base, clothed with ochreous and cinere- 

 ous hairs, evenly intermixed. Scutellum sub-quadrate, emarginate at tip and 

 not impressed along the middle, clothed with whitish pubescence. Elytra 

 rather suddenly broader than the thorax, as wide as long, sides arcuate, sur- 

 face moderately convex, humeral protubera'nce feeble, striate, striae punctured, 

 intervals flat, densely punctulate, clothed with dark ochreous and cinereous 

 pubescence evenly intermixed. Pygidium nearly vertical, broader than long, 

 moderately convexed near apex, clothed with whitish pubescence. Body be- 

 neath black, densely punctulate, sides of metasternum coarsely punctured, 

 evenly clothed with cinereous pubescence. Legs pale rufous, hind femora 

 piceous at base and armed near the tip with a slender, long, sub-arcuate tooth 

 on the inner side and a short, broad tooth acute at tip on the outer side. 

 Length .10— .12 inch ; 2.5—3 mm. 



The strongly rounded sides of the thorax give this species a very- 

 different appearance from the other two of this group. Its uniformly 

 black color and cinereo-ochreous vestiture will still further help to 

 distinguish it. The outer tooth of the hind femur is much less 

 marked, but at the same time more acute at tip. It bears a greater re- 

 semblance to the species of Group V. than to the present group, but 

 the distinct external tooth at once fixes its position. 



The specimen before me is a female and from the form of its anten- 

 nae would infer that those of the male were at most sub-serrate and 

 not pectinate. 



Collected in the Peninsula of Lower California. 



Several other species which I have not certainly identified belong to 

 this group. 



B. biguttellns, Sch. Cure, i., p. 42; biguttatus || Fab. Syst. El. ii., p. 

 402. — Thorace nigro, lineolis duabus baseos scutelloque albis, elytris basi runs, 

 antennis flabellatis. 



This species appears to be a dark colored male of scutellaris. The 

 flabellate antennae would seem to indicate that it must be referred to 

 this group or the next in which such a character occurs. Schonherr 

 places it among the species with dentate femora, although he did not 

 know the species in nature. 

 " Patria, Carolina." 



