444 Memoirs on the Coleoptera 



seem to ally it with Centrinogyna, but the body in the latter genus 

 is more parallel and less rhombiform, among other differences. 



Nicentrus Csy. 



This genus is distinguished from Centrinaspis primarily by the 

 elongate cylindrical form of the body. The mandibles close along 

 their inner edge almost similarly, but their external outline is more 

 rounded, and, along the inner edge, there is nearly always some 

 crenulation. The presternum is never armed in the male. The 

 species are very numerous, those in my collection at present being 

 definable as follows: 



Prothorax inflated, rounded at the sides and fully as wide as the elytra. 

 Body larger than in any other species, rather stout, convex, piceous- 

 black, the legs rufous; squamules .of the upper surface yellowish, 

 slender, uniform and not dense on the prothorax, and closer, con- 

 spicuous and in two to three series on the strial intervals; under 

 surface with white scales, dense along the sides; beak stout, espe- 

 cially in the male, feebly arcuate, about as long as the head and 

 prothorax, the antennae inserted near three-fifths (cf) or just beyond 

 the middle (9); prothorax a fourth (cf) to two-fifths (9) wider 

 than long, arcuately narrowing before the middle, coarsely, rugosely 

 and densely punctate but shining; elytra two-thirds longer than the 

 prothorax, the very moderately oblique sides broadly arcuate, the 

 apex somewhat obtusely rounded ; striae deep, abrupt, moderately 

 coarse, the intervals flat, somewhat finely, loosely and confusedly 

 punctate. Length (cf 9 ) 3-8-4.7 mm.; width 1.65-2.0 mm. 

 Florida (Haw Creek) grossulus Csy. 



Prothorax not inflated, always at least somewhat narrower than the 

 elytra 2 



2 — Body parallel, subevenly clothed above, the size rather large; pro- 

 thorax barely visibly narrower than the elytra. Piceous-black, the 

 beak black, the legs rufous; squamules above slender, not close-set 

 and 3'ellowish, fine on the pronotum, coarser, conspicuous and in 

 two or three irregular lines on the strial intervals; under surface 

 with white scales, generally narrowly separated; beak in the female 

 slightly arcuate, smooth, somewhat thickened, bent and squamulose 

 at base; antennae inserted just beyond the middle; prothorax three- 

 sevenths wider than long, the sides parallel, feebly arcuate, rounding 

 in about anterior half, the apex feebly subtubulate and half as wide 

 as the base; punctures rather small, moderately close, the sculpture 

 faintly ruguliform longitudinally, very much finer than in grossulus; 

 smooth median line distinct centrally; scutellum albido-squamose, 

 quadrate; elytra four-fifths longer than the prothorax, the feebly 

 oblique sides broadly and distinctly arcuate, the apex evenly, not 

 broadly rounded; humeral swellings very feeble; striae abrupt, 



