246 MEMOIRS ON THE COLEOPTERA 



has scarcely perceptible senescent lustre; the elytral intervals are 

 perfectly flat, while in the other species the intervals are distinctly 

 convex in the male, though flat in the female. The elytra in this 

 male example are notably wider than the prothorax. I have not 

 seen fortis Lee. shining in both sexes, said by Horn to belong to 

 this genus. 



Celia Zimm. 



This is by far our largest genus of the Amarinae and only an in- 

 significant fraction of the species have been described. The body 

 is very moderate in size and includes some of the smallest species 

 of the subfamily; the coloration is frequently pale, even when mature, 

 with the integuments rather thin, sometimes almost diaphanous, 

 although the erratica and californica groups have dense integu- 

 ments as in Amara. The mentum tooth is bidentate, the prosternal 

 lobe always sharply and rather finely margined and the middle 

 tibiae unmodified sexually; the posterior male tibiae are not pubes- 

 cent within. The anterior strioles of the head are fine and moder- 

 ate, sometimes feebly oblique. In our fauna there are six well de- 

 fined subgeneric groups, each easily recognizable by reason of gen- 

 eral habitus; they may be defined as follows: 



Legs black; body oblong-oval, with dense and frequently metallic integu- 

 ments; prosternum not evidently modified in the male; facies some- 

 what as in Amara; the pronotum wholly impunctate. ... I (erratica) 



Legs not black 2 



2 Prosternum with an elongate opaque central impression in the male; 

 integuments dense; body oblong-oval; pronotum nearly as in the 

 preceding group, impunctate II (californica) 



Prosternum of the male with an unimpressed central spot, which is very 

 finely punctulate 3 



Prosternum of the male unmodified or with vestigial punctulate spot. .4 



3 Anterior male tarsi strongly dilated; sides of the prothorax straight 

 or subsinuate basally; integuments dense; body parallel, the pro- 

 thorax less abbreviated Ill (rectangula) 



Anterior male tarsi moderately to feebly dilated ; prothorax more abbre- 

 viated, the sides arcuate to the base; body oblong-oval; integuments 

 thin and paler as a rule IV (remotestriata) 



4 Body more elongate, subparallel, with metallic lustre and usually 

 dense integument, the elytral striae always very fine, generally im- 

 punctate V (aurata) 



Body less elongate, more oblong-oval, never having pronounced metallic 

 lustre and with the integuments generally thinner and more or less 

 pallid; elytral striae less fine and more impressed as a rule and usu- 

 ally distinctly punctate; species including the smallest of the genus. 



VI (rubrica) 



