6 MEMOIRS ON THE COLEOPTERA 



5 Sexguttata group. 



Resembles the preceding very strikingly in facies, in the hairless 

 front in both sexes, well developed tarsi, form of maculation and 

 in many other features, but differs in the shorter labrum and finer, 

 feebler sculpture. It comprises sexguttata and violacea Fabr., 

 patruela and consentanea Dej., harrisi Leng and levettei and tridens 

 Csy. Tridens is the immaculate bright pure green form found at 

 Onaga, Kansas; it differs from the immaculate forms of levettei, 

 which occur especially in the south, in its shorter and broader 

 outline. The true molacea I have not seen; it may possibly be one 

 of the scutellaris group. 



6 Nigroccerulea group. 



I would associate together in this group nigroccerulea Lee. and 

 feminalis, triplicans, snowi, velutoidea, tumidifrons, filitarsis and 

 aterrima Csy., also townsendi*; probably viatica Chev., enthales 

 Bates, of Durango, Mexico, and other similar forms are to be in- 

 cluded also. The elytral sculpture is always feeble, often obsoles- 

 cent, the tarsi long, the front generally bald in both sexes, the size 

 of the body small or moderate, the elytral apices non-serrulate and 

 the pale maculation wanting or small and disconnected. The 

 taxonomic forms, whether species or subspecies, are numerous, but 

 individuals are comparatively very rare in collections; the types of 

 tumidifrons, filitarsis and aterrima are from Chihuahua. 



7 Scutellaris group. 



This is a well defined group, in which the body becomes unusually 

 short and stout in build, the front pubescent in the male, the elytral 

 punctures nearly obsolete and the tarsi only moderate in length. 

 The species and subspecies are scutellaris Say, rugifrons, modesta 

 and unicolor Dej., lecontei Hald., nigrior Schaupp and criddlei*. 

 No one seems to know as yet the true relationships of these various 

 developments, but it should be said that they hold as truly to the 

 typical form and coloration in each case as do the species of any 

 other natural group. There is nothing to be gained and much 

 complication of our nomenclature to be incurred by considering 

 them, provisionally at least, as anything else than species. The 

 same remark applies to other groups such as pur pur ea and blanda. 



