276 MEMOIRS ON THE COLEOPTERA 



the punctures in imitatrix seem to be somewhat different, being 

 distinct but not rounded or deep in all the striae except the deeper 

 sutural. The evanescent seventh stria is a group character, as well 

 as the constantly rather broadly interrupted line of ocellate punc- 

 tures of the eighth. The scutellar stria is less definite and more 

 fugitive than in any other group of this genus, although also a 

 feature of the very small species of group VI to some degree. It 

 is interesting to note that the species having a more elongate pro- 

 thorax are characteristic of the more northern faunas, while those 

 with shorter and more transverse prothorax are, so far as known, 

 confined to southern and insular regions. 



Group VI 



The species of this group are all small and include among them 

 the smallest of the Amarinse; they are unexpectedly numerous, 

 also, constituting a very difficult study; after developing sufficient 

 familiarity, however, the species are found to be no more indefinite 

 than in any other part of the Celia series. They are characterized 

 in general by a very convex body, with highly polished surface and 

 frequently pallid, though generally rather thick, integument; in all 

 but a few cases they are similar in the sexes, so far as lustre is con- 

 cerned, although some, such as karpalina, have alutaceous elytra 

 in the female; they also have deep and coarse, sometimes strongly 

 punctate, elytral striae and completely lack a prosternal punctured 

 spot in the male. There is seldom any trace of metallic coloration, 

 the name subcsnea, given by LeConte, being in great part fanciful. 

 It is also to be noted that the group does not occur in the Pacific 

 coast regions of the continent, excepting, so far as known at pres- 

 ent, the single species simwsa, of British Columbia. Those in my 

 collection may be known as follows: 



Form elongate; prothorax but little wider than long, much narrowed 

 anteriorly, the apex deeply sinuate and with prominent, scarcely 

 at all blunt angles; elytra (9 ) generally feebly alutaceous 2 



Form usually less elongate, the prothorax more transverse, the apex very 

 feebly sinuate and with broadly blunt angles 7 



2 Head at least half as wide as the prothorax - 3 



Head very small, distinctly less than half as wide as the prothorax in 

 both sexes 4 



3 Body elongate-suboval, convex, shining, piceous-black, the proster- 

 num, abdomen and legs rufous; head half as wide as the prothorax, 



