244 MEMOIRS ox THE COLEOPTERA 



and tapering distally, extending to apical fifth of the elytra, the last 

 joint serriform, nearly like the preceding and about as long but 

 slightly narrower, the appendage, which extends from the upper 

 part of its similarly oblique apex, half as long and wide as the joint, 

 attached to it rigidly and without suture; on the right antenna this 

 terminal process, instead of being differentiated, is fused to the apex 

 of the joint throughout its width, forming a single very long joint, 

 with a subdifferentiated apical slope, as mentioned in most of the 

 foregoing species and indicating that this twelfth joint of the male 

 is composed of what may have been two distinct joints in the arche- 

 types of the genus; this consolidated joint of the right antenna is 

 nearly one-half longer than the preceding, being on both antennae 

 very much more elongate than in any other species; prothorax 

 rather small, nearly as in calif ornicus throughout; scutellum very 

 obtuse; elytra about three-fifths longer than wide, two-fifths wider 

 than the prothorax, moderately tapering, with distinctly arcuate 

 sides, to the moderately obtuse apex, the punctures somewhat small 

 but strong, well spaced, the raised lines very feeble; on each there 

 is a feeble longitudinal impression at the middle near outer third; 

 metasternum as strongly pubescent as in californicus; tarsi nearly 

 as in that species. Length (cf) 34.0 mm.; width 13.8 mm. Arizona 

 (Canon of the Colorado) , Prudden terminalis n. sp. 



Without knowing the species described above under the name 

 kempi, in honor of Prof. James F. Kemp of Columbia University, it 

 would have been difficult to place the curticornis of LeConte, but 

 that form gives a very satisfactory clue and, together with kempi, 

 it constitutes a well marked and distinctly isolated group of the 

 genus. I do not think that kempi can be identical with curticornis, 

 however, as they differ very much in size, in geographic habitat 

 and in the apparently greater thoracic width of the former. Obligui- 

 cornis of LeConte, seems to have the antennae thicker and more 

 imbricate basally than in pocularis, resembling more those of the 

 western forms, from which it probably differs specifically since it 

 occupies a different zoological province; it is correctly recorded as 

 a valid species in the Munich catalogue. One female specimen of 

 tristis departs considerably from the type in having the elytra for 

 the most part perfectly smooth, with the punctures everywhere very 

 fine, remote and feeble, becoming obsolescent on the flanks and 

 also having the prothorax relatively wider. 



It is impracticable to include heroicus Semenov (Rev. Russ. Ent., 

 7, p. 259) a name substituted for heros Fall (Can. Ent., 1905, p. 

 274) because of the previous use of the latter by Semenov himself, 

 as no characters are published which admit of its interpolation in 



