138 MEMOIRS ON THE COLEOPTERA 



deeper, not at all interrupted medially and strongly viridi-rugose, 

 the foveee larger, shallow and strongly rugose, the carina distinct; 

 elytra three-fifths longer than wide, fully two-fifths wider than the 

 prothorax, parallel, with nearly straight sides, rapidly obtuse at 

 apex; striae nearly as in consimile but scarcely impressed, the punc- 

 tures finer; foveae near basal third, at three-fifths and at six-sevenths. 

 Length (cf ) 4.8 mm.; width 1.7 mm. Utah henshawi Hayw. 



The division of the greater part of the very numerous species of 

 the variegatum section of Notaphus on geographic lines, appears to 

 be appropriate, since no species known to me inhabits regions both 

 to the east and west of the great backbone of the continent; some 

 found on the Pacific slope resemble and have been confounded with 

 eastern species of the patruele type, but they are all distinct and no 

 more than closely allied. This division, as established by natural 

 evolution, is a boon not only to the taxonomist, but to the collector 

 endeavoring to identify his material, since sharply drawn differ- 

 ential characters of a general nature are exceedingly few in this 

 most difficult section of the subgenus. It should also be said, in 

 reference to the first character used above to define sections of the 

 subgenus Notaphus, that there are some exceptions. For instance, 

 under those having the base of the prothorax as wide as the apex 

 or wider, a few such as extricatum, caudex and pimanum, have the 

 base more or less evidently narrower than the apex, but the rest of 

 the organization and peculiarities of ornamentation prevent us from 

 disassociating them. So also in the case of the so-called dentellum, 

 the prothorax is not narrower at base than at apex, but the general 

 physiognomy of that species places it among the allies of constric- 

 tum; in graciliforme Hayw., in fact, the base is said to be narrower 

 than the apex, though this is not apparent in a specimen which I 

 received under that name, said to have been identified by the author 

 himself. It is because of the existence of the subspecies gracili- 

 forme, that I regard this dentettum-like form to have been long estab- 

 lished in America, and therefore probably not identical with the 

 European dentellum; it is recorded above under the LeContean name 

 arcuatum. 



The species imperitum and prociduum, above described from the 

 Puget Sound region, are sometimes identified as coloradense Hayw., 

 but the statements that the prothorax is nearly twice as wide as 

 long and the elytra only slightly wider than the prothorax in colo- 



