596 Coleopterological Notices, IV. 



robust, oval, abrupt, nearly as long as the five preceding joints 

 together, densely pubescent and with the basal joint constituting 

 about two-fiiths of the mass. Prothorax much wider than long, 

 with the sides almost parallel and feebly arcuate in basal two- 

 thirds, then strongly rounded, the apical constriction extremely 

 feeble, the punctures fine and very dense, tending to longitudinal 

 coalescence ; median impunctate line distinct. Scutellum very 

 densely squamose. Elytra a little wider than the prothorax and 

 more than twice as long, rather less strongly narrowed to the apex 

 than usual, the striae somewhat fine but deep. Prosternum with a 

 transverse subapical constriction, and a rather narrow moderately 

 deep parallel sulcus along the middle, the sides of the sulcus some- 

 what abruptly defined ; anterior coxae separated by scarcely more 

 than one-fourth of their own width. Length 3.6-4.0 mm.; width 

 1.6-1.8 mm. 



Alabama and Iowa. In some respects this species forms a satis- 

 factory passage from the species with armed male prosternum, to 

 those of the scute Hum- album group. I have been unable to note 

 any prominent secondary sexual modification of the male. 



X. 



25 Centrinus scutelliini-altmm Say — Cure, p. 21, Ed. Lee, I, p. 

 287 (Baridius scut. Germ. : Sch. Cure, III, p. 730). 



Subrhomboidal, convex, rather robust, the vestiture consisting of 

 small, more or less narrow sparse white scales, which become large 

 broad and dense on the under surface. Beak nearly straight, a little 

 more than one-half as long as the body, abruptly and strongly bent 

 at base, the flanks flattened and deeply longitudinally punctato- 

 rugulose throughout, more strongly arcuate along the under outline 

 behind the antennae, the latter inserted near apical third in the male, 

 the basal joint of the funicle moderate in length, the second rather 

 long, fully three-fourths as long as the first and subequal to the 

 next three, joints three to seven small ; club large, elongate, oval, 

 densely pubescent, fully two-thirds as long as the funicle, the sutures 

 feeble, arcuate on the inner side, the basal joint constituting a little 

 more than one-third of the whole, nearly as long as wide, with a 

 large tumid glabrous and polished area on the inner side, at the 

 middle of which there is an erect acute spiniform process. Protho- 

 rax wider than long, scarcely at all constricted, the punctures rather 

 coarse, deep, rounded, almost in mutual contact. Elytra distinctly 





