216 MEMOIRS ON THE COLEOPTERA 



sides moderately converging and nearly straight, becoming gradually 

 rounded and more converging before about the middle; basal angles 

 very distinct, as in the preceding; basal lobe distinct, evenly rounded; 

 punctures strong laterally, sparse (cf ) , rather dense ( 9 ) , in the former 

 close-set anteriorly; medially, the punctures are small and rather 

 sparse, becoming very remote basally; scutellum as in the preceding; 

 elytra not at all (cf 1 ) or but just visibly (9 ) longer than wide, dis- 

 tinctly but gradually inflated behind, a fourth to two-fifths wider than 

 the prothorax and much less than twice as long, rather abruptly and 

 very obtusely rounded at apex, the striae broadly and deeply im- 

 pressed nearly as in the preceding, except that the second interval 

 has only a remotely spaced series of very small feeble punctures, 

 which are wanting in apical half as usual; pygidium (cf) notably 

 convex, strongly arcuate above and with strong entire lower beading, 

 or ( 9 ) much more transverse, shorter, with broadly interrupted 

 lower beading. Length (cf 9 ) 13.5-14.3 mm.; width 8.7-9.2 mm. 

 Maine (Paris) male, and New Hampshire female. 



aterrimus n. sp. 



Pygidium of the male finely, densely and very evenly rugulose through- 

 out, without trace of smoother area or of any kind of punctuation; 

 body nearly as in aterrimus but with the elytra less broadly inflated, 

 shining, the under surface blackish-piceous; head small as usual, 

 having transversely waving and interlacing, longitudinally widely 

 separated rugulae throughout, with only an extremely fine raised 

 transverse line representing the transverse ridge, the clypeus short 

 and trapezoidal as usual, the three teeth obtuse; prothorax throughout 

 as in the preceding, except that the converging sides from base to 

 apex are evenly and moderately arcuate, the basal angles rather 

 blunter, and that there is an entire punctureless median line; scu- 

 tellum slightly broader, though longer than wide; elytra barely 

 visibly longer than wide, barely a fourth wider than the prothorax 

 and distinctly less than twice as long, not so abruptly or obtusely 

 rounded behind and with more feebly, much less broadly impressed 

 striae, the annuli within the impressed punctures very much smaller, 

 the second interval with more numerous and much coarser punctures 

 and the fourth also with a line of punctures; punctures on the apical 

 declivity similarly confused but even more completely obliterated 

 and shallow; pygidium strongly convex, black, its lower beading 

 broad, flat, entire but with its inner margin irregular, broadly sinuate 

 at each side and feebly so at the middle; abdominal bead strong; 

 legs slender. Length (cf) 14.0-14.3 mm.; width 8.8-8.9 rnm. 

 Pennsylvania densicauda n. sp. 



6 Hind tibiae slender and a little shorter, the tarsi slightly longer, so 

 that the tibiae and tarsi are subequal in length, barely differing in 

 the female. Body stout, less so in the male, very convex and 

 polished, bright though rather dark red-brown, still paler and 

 brighter rufous beneath, the legs obscure rufous, the femora paler; 

 head small, with transversely interlacing and widely separated rugu- 

 lae, the transverse carina represented by a very fine, posteriorly 

 arcuate raised line; clypeus unusually concave, short, trapezoidal, 



