AMARIN.E 235 



widest prothorax and the pubescent inner surface of the posterior 

 male tibiae, the latter a character reproduced exactly however in 

 Amara and Tritzna. 



In regard to the general form and habitus of the body, there are 

 four subgeneric groups as follows : 



Body very stout and convex, oblong-oval, with notably coarse and deeply 

 impressed striae and very convex intervals I (exaratus) 



Body less stout, with finer and less impressed striae, the intervals flat or 

 but slightly convex 2 



2 Body narrow and elongate, the sides of the prothorax distinctly sin- 

 uate at base II (apricarius) 



Body less narrow to somewhat stout, the sides of the prothorax never 

 distinctly sinuate at base 3 



3 Prothorax relatively very short, with the sides oblique and nearly 

 straight in about basal half, the carinae obsolete; prosternum of the 

 male with a large medial unimpressed area of diffused punctures; 

 colors metallic Ill (nainensis) 



Prothorax longer, the sides subevenly arcuate from apex to base, the 

 carinae usually distinct; prosternum with an elongate-oval and sub- 

 impressed punctured area in the male, wanting in immundus; colors 

 never metallic IV (latior) 



As may be seen these groups are based chiefly upon habitus, but 

 this is so marked as to identify the various groups at first sight. 

 The species are not numerous and those at hand may easily be 

 recognized as follows: 



Group I 



The punctate prosternal area of the male is not impressed, though 

 well defined, and in that sex the anterior tarsi are but feebly di- 

 lated, contrasting greatly with the broad dilatation in Curtonotus; 

 the dilated joints have each a small quadrate subapical pale mem- 

 branous lamina beneath. The inner side of the posterior male 

 tibiae has but very few stiff hairs, sometimes scarcely discoverable. 

 We have several species as follows : 



Body larger, very stout. Oblong-oval, very convex, piceous-black, the 

 legs obscure rufous; upper surface highly polished throughout in 

 both sexes; head three-fifths as wide as the prothorax, the eyes large 

 but not very prominent, the strioles fine and short; antennae slender, 

 obscure ferruginous, not extending to the thoracic base; prothorax 

 barely one-half wider than long, subparallel, widest at the middle; 

 apex sinuate, narrower than the base, with bluntly rounded angles; 

 base transverse, feebly sinuate at each side; sides broadly and sub- 

 evenly arcuate, becoming gradually feebly sinuate toward the hind 



