2i 8 MEMOIRS ON THE COLEOPTERA 



general bodily structure, however, it is to be noted that these two 

 species have the form, size and habitus of the elytra, prothorax 

 and head virtually identical ; it might be further noted that it is 

 only in those forms having protuberant mesosternum, that the 

 elytra become bidenticulate or biangulate at apex, this being 

 very pronounced in multiguttatus and feebly evident in cyanipennis, 

 all the other species having broadly rounded tips, with sharply 

 angulate but wholly unproduced sutural angle. 



The genus Gaurotes, therefore, will be made up in our fauna of 

 the species cyanipennis Say, the type of the genus, cressoni and 

 abdominalis Bland, thoracicus Hald., bivittatus Say, nigripennis 

 Lee., this being by no means a variety of bivittatus but a distinct and 

 valid species, of which varians Lee., is probably the male, fusciceps 

 Lee., which is also a valid species and not a variety of bivittatus, 

 and the following two, the first of which is closely allied to bivittatus, 

 being almost identical in ornamentation and sculpture: 



Gaurotes oblongus n. sp. Form, coloration, two black vittae on each 

 elytron and elytral sculpture of rather coarse, deep, moderately separated 

 punctures, as well as the very sparse vestiture of infinitesimal hairs 

 throughout, as in bivittatus; head relatively still smaller, only two-thirds 

 as wide as the prothorax, black, testaceous before the antennae and with 

 a large transverse basal area of the same color, strongly, densely sculp- 

 tured, perfectly flat between the small eyes, which are scarcely at all 

 prominent, the moderately retracted tempora at first subparallel, then 

 converging to the base; antennae longer and thicker, black, the first and 

 fifth joints relatively longer; prothorax testaceous, larger, more trans- 

 verse, a third wider than long and evidently wider at base than across 

 the ante- median lateral prominences; legs thick, wholly black. Length 

 (9 ) 9-8 mm.; width 4.2 mm. Nebraska. 



Differs from bivittatus in its larger size, relatively smaller head, 

 with much less prominent eyes, in the red area of the occiput, 

 thicker antennae, with much more elongate basal joint, in the very 

 much thicker legs and tarsi and basally broader prothorax. The 

 subgeneric group to which it belongs includes also thoracicus Hald., 

 nigripennis Lee. (varians Lee.) and fusciceps Lee., and has the 

 vittate form of ornamentation predominating as in Disonycha of the 

 Chrysomelidae, where numerous true and not closely related species 

 have nearly similar or virtually identical elytral ornamentation. 



The following species is allied to cressoni but is larger and much 

 stouter : 



