NORTH AMERICAN COLEOPTERA. 291 



12. — Thorax without basal marginal line; thorax entirely black. 



Elytra piceous, with pale apex, varying to entirely rufo-castaneous; sur- 

 face distinctly punctulate; palpi and auteunse piceous. 



hseniorrhoidalis. 

 Elytra reddish, with a large scutellar triangle and humeral stripe piceous. 

 Palpi pale; epipleurfe piceous; elytra very distinctly punctulate. 



melanocephalus. 

 Palpi pale, last joint piceous; epipleurse pale; elytra indistinctly punc- 

 tulate pygmseus. 



Thorax with distinct basal marginal line ; thorax paler at the sides ; elytra 

 pale, with a transverse piceous band behind the middle; palpi pale. 



iiigriceps. 

 13. — Surface opaque, more or less alutaceous. 



Entire surface alutaceous ; elytral striae fine, but reaching the apex, which 



has a pale spot lugtibris. 



Elytra alone alutaceous, the striae extremely fine and not reaching the 



apex, which has a pale spot tristis. 



Surface shining. 



Elytral striae deeply impressed, the intervals convex at sides and apex, a 

 sharply defined apical pale spot, which extends narrowly along the 

 sides to base; intervals scarcely distinctly punctulate; body beneath 



opaque floridanus. 



Elytral striae moderately deeply impressed and deeper at apex, which has 

 no pale spot, intervals sparsely punctulate ; beneath opaque. 



granarius. 

 Elytral striae replaced by rows of fine punctures, intervals sparsely punc- 

 tulate, apex with a rufous space extending slightly along the suture ; 



beneath shining iiavicularis. 



14. — Pale rufo-testaceous, head piceous ; elytral striae deep, especially at sides aud 

 apex; metasternal area not extended pubescent. 



C littoralis Gyll. — Oblong oval, moderately convex, piceous black, shin- 

 ing, elytra usually with a pale space at apex extending more or less along the 

 side. Antennae testaceous, club piceous, palpi piceo-testaceous, last joiut darker. 

 Head sparsely indistinctly punctate. Thorax transverse, sides arcuate at middle, 

 narrowed at apex and base, hind angles slightly obtuse, no basal marginal line, 

 disc regularly convex, without trace of basal impressions, surface not closely 

 punctate, the punctures finer in front. Elytra striate, the tenth indistinct, striae 

 deeper at apex and with fine close punctures, intervals slightly convex on the 

 disc, more so near apex, punctulate more finely and closely than the thorax. 

 Body beneath piceous opaque, the metasternal area shining and sparsely punc- 

 tulate. Prosternum feebly carinate, mesosterual elevation narrowly oval, 

 sparsely punctulate. Legs rufo-piceous. Length .10 — .12 inch. ; 2.5 — 3 mm. 



Several variations in color have been recorded for this species in 

 Europe, but in the few that I have seen from our coasts very little 

 difference has been observed, except that one specimen with a slightly 

 paler thorax has a pale spot each side of the scutellum. The apical 

 pale spot may be entirely absent. This species is remarkable in 



