PTEROSTICHIN/E 373 



scarcely extending to the thoracic base, dark ferruginous; prothorax 

 much wider at apical third than at apex, two-fifths wider than long, 

 the sides sharply but not broadly reflexed, strongly, evenly rounded 

 to the very small basal sinus, the angles right and minutely prom- 

 inent; base sinuate medially, margined in lateral third, much nar- 

 rower than the distinctly sinuate apex; anterior impression rather 

 deep and sublinear, the posterior obsolete; foveae smooth, very deep, 

 elongate-oval, discal; elytra two-thirds longer than wide, nearly a 

 fourth wider than the prothorax, the arcuate sides more rounded at 

 base, gradually arcuately converging in apical half; striae deep, not 

 coarsely but strongly and rather distantly punctate, obsolete at 

 apex, the fifth very feeble, sixth and seventh subobsolete through- 

 out; scutellar stria wholly wanting; intervals broadly convex inter- 

 nally; abdomen very coarsely, confluently punctured except medi- 

 ally. Length (9 ) 9.7 mm.; width 3.3 mm. Texas. . subacuta n. sp. 

 Body stout, very convex, smaller, black or piceous-black and polished; 

 under surface obscure, the legs brighter, rufous; head nearly as in 

 the preceding, the eyes larger and more prominent; prothorax al- 

 most perfectly similar throughout, except that the anterior trans- 

 verse impression is very feeble and diffuse, and that the hind angles 

 are obtuse and blunt, not in the least prominent; elytra similar in 

 form and proportion, the striae much coarser, very deep and coarsely 

 punctate, the fifth like the others, the sixth evidently feebler but 

 distinct, the seventh subobsolete, all subobsolete or feeble at apex; 

 scutellar similarly wholly wanting; intervals broadly and not very 

 strongly convex; abdomen less coarsely and more loosely punctate. 

 Length (9) 7-7 mm.; width 2.8 mm. Texas (Houston). Taken 

 by the writer. Louisiana LeConte. [Pterost. tnmescens Lee.] 



tumescens Lee. 



The species named subacuta above, answers so closely to LeConte 's 

 description of his Evarthrus acutus placed in Ferestria by Leng 

 that I have for some time considered it to be identical, but on study- 

 ing this description more carefully, it may be inferred that in acutus 

 the head is large and obtuse, the antennae black basally and the 

 prothorax not at all narrowed at apex, which is scarcely emarginate. 

 Furthermore, in identifying it as Evarthrus acutus we should have 

 to assume that LeConte overlooked the three dorsal punctures of 

 the elytra, and also the very coarse confluent abdominal punctures 

 of subacuta. This must be admitted, however, to be a striking in- 

 stance of parallelism in two different generic groups. 



Cryobius Chd. 



The met-episterna in this genus, though short enough to distin- 

 guish the numerous components from the smaller forms of the Ar- 



