AMARIISLE 271 



obviously not identical, corvina being smaller, narrower, more 

 parallel and with highly polished male elytra. Again, amplipennis, 

 as described above, must be allied rather closely to gibba Lee., 

 having the elytral base similarly distinctly wider than the pro- 

 thorax, but gibba, of the Lake Superior region, differs in its darker 

 coloration, obscure femora, more convex upper surface and other 

 characters. The reference of apachensis Csy., by Dr. Horn, first 

 to remotestriata and subsequently, after another superficial obser- 

 vation, to gibba, were wholly arbitrary and erroneous statements. 

 The above series of four species from terrestris to mimica, are 

 those referred to remotestriata by Dr. Horn, but as these four spe- 

 cies are valid among themselves and remotestriata was described 

 from Unalaska Island, I am forced to hold that the true remote- 

 striata does not occur within our more southern faunal areas and 

 that terrestris and the other three species referred to are amply 

 valid. 



Group V 



In the aurata group the body is narrower, more parallel and 

 more elongate than in the preceding remotestriata group, and met- 

 allic coloration is the rule rather than the exception; the integu- 

 ments, also, are generally though not always thicker and firmer. 

 A few fine central punctures on the male prosternum are appar- 

 ' ently observable in some of the species, so that the presence of this 

 prosternal punctulation in imitatrix, referred by Horn for this 

 reason to the gibba group of that author, does not have the im- 

 portance attached by him to the character; imitatrix is in fact a 

 member of the aurata group, and is included in the following table 

 of the species known to me at present; the line of ocellate punctures 

 of the eighth stria is invariably interrupted submedially: 



Elytral striae distinctly punctulate. Body elongate-subparallel, rather 

 convex, polished, black, with feeble aeneous lustre, the thoracic side 

 margins diaphanously rufous; under surface black, the legs dark 

 rufous; head moderate, with prominent eyes and deep oblique stri- 

 oles; antennae slender, extending well behind the thoracic base, fusco- 

 ferruginous, paler basally; prothorax one-half wider than long, the 

 sides nearly parallel in basal, gradually converging and rounded in 

 apical, half; apex sinuate, much narrower than the base, with mod- 

 erately blunt but somewhat prominent angles; sides rounding in at 

 base, the angles obtuse; basal region with small scattered punctures, 

 feeble medially; inner fovea broadly impressed, linear, the outer 



