j U ne.- Casey: North American Coleoptera. 73 



Surface strongly shining; sutural elevation on the declivity strong, its summit for a 

 short distance at the middle of the declivity, still more elevated, dilated and 

 canaliculate. Female.— Similar to dinoderoides but smaller, the epistomal suture 

 more deeply impressed and more remote from the apical margin. Prothorax 

 nearly as long as wide, similar to dinoderoides but still more sparsely punctate 

 toward base. Elytra rather coarsely, strongly punctured and very densely so, 

 the punctures rather sparser toward the suture except on the declivity, but not as 

 sparse as in dinoderoides, the surface unevenly rugose by anteriorly oblique light. 

 Under surface finely and densely punctulate, confluently so on the sterna. Length 

 3.4 mm.; width 1. 15 mm. District of Columbia cristicauda, sp. nov. 



3 — Size larger, 6.5 mm. in length. Body piceous, the elytra brownish; head opaque, 

 tuberculate, the maxillary palpi with the last two joints equal; prothorax wider 

 than long; elytra not wider than the prothorax, very coarsely and closely punc- 

 tate, the punctures of the declivity coarser and denser, the sutural region slightly 

 elevated, especially in the apical declivity. Body beneath moderately densely 

 punctate, sparsely pubescent. Texas (southwestern) simplex Horn 



I have here regarded the specimens recently taken by Mr. Wickham 

 in the extreme southern part of Texas, near Brownsville, as represent- 

 ing the true dinoderoides, but actual comparison will be necessary lo 

 decide, as these examples are certainly strongly shining. 



Dinoderus Steph. 



The rather numerous species of this genus may be outlined in the 

 table which follows. Punctatus and truncates are the only discordant 

 elements after eliminating brevis, and they may have to be separated at 

 some future time. 



Apex of the elytra convex, the suture only very rarely somewhat prominent, the 



apical margin not concave or prominently margined ; pubescence erect 2 



Apex of the elytra more abruptly truncate, concave and prominently margined at tip; 



■ pubescence decumbent 13 



2 — Pronotum with granuliform and separated tubercles toward base 3 



Pronotum with flattened and generally subcontiguous tubercles toward base ; side 

 margins almost devoid of senulation except at apex ; body more cylindro- 



convex .' , 8 



3 — Elytra polished or strongly shining 4 



Elytra opaque ; color dark brown or blackish-piceous 5 



4 — Elytra with very close-set perforate punctures, larger than the width of the in- 

 tervals, the latter tuberculose ; color dark brown throughout. Michigan, Can- 

 ada and Europe substriatus Payk. 



Elytra with less coarse and impressed punctures, not larger than the width of the 

 intervals, the latter less elevated and more feebly but distinctly tuberculose; 

 color black or blackish. Head moderate, exserted, with a polished constriction 

 at base as usual; surface subopaque, granulose, the epistomal suture distinct; 

 apex sinuate; eyes small, convex; antennas stout, dark rufous, not as long as the 



