io MEMOIRS ON THE COLEOPTERA 



hesperus Wickh., in this generic assignment. It is probable that 

 the feeble sulcation of the elytra referred to is to some extent ac- 

 cidental, as before remarked; and in fact one of my examples of 

 oblongns exhibits a faint longitudinal costulation by oblique illu- 

 mination, though this is unaccompanied by the feeblest trace of true 

 striation. But in hesperus mention is made of a distinct frontal 

 fovea, and it is said that the antennae are relatively much stouter 

 than in lecontei; as the antennas in the latter are not materially more 

 slender than in the prevailing type of Morychus, it may be that 

 we have here another decisive divergence; these discrepancies, 

 together with the aberrant coloration of the legs, render the as- 

 signment of hesperus to Morychus somewhat doubtful. Lateralis 

 Fall, is also doubtfully attached to Morychus and I would assign it 

 to the genus Tylicus, which follows, in company with subcanus Lee., 

 if it were evident that the abdominal sutures were perfectly straight 

 and not arcuate. Subcupreus Fall, is almost undoubtedly a close 

 congener of oblongus and subsetosus, but of ceneolus Lee., the pub- 

 lished characters are not sufficient to warrant a decision. 



Tylicus n. gen. 



The perfectly rectilinear abdominal sutures in this genus form a 

 striking and apparently valid taxonomic character, accompanied as it 

 is by a number of other more or less evident differences. Thevesti- 

 ture of the upper surface, for example, is not uniform in distribution 

 as it is in Morychus, but is condensed into streaks and spots; but, 

 singularly, this condensation is not accompanied by any material 

 condensation of the punctures, for under sufficient optical power 

 the punctures are observed to be distributed uniformly under these 

 patches of condensed pubescence, just as they are in Morychus, 

 showing that it is only those genera in the tribe Pedilophorini having 

 deep and abrupt fossae for the reception of the hind legs, that the 

 sculpture of the elytra becomes irregular. 



The single type of Tylicus may be known by the following short 

 diagnosis of LeConte: 



Elongate-oval, convex, rounded behind, obliquely narrowed in front of 

 the elytra, black, irregularly mottled with very short gray pubes- 

 cence like hoar-frost and thinly clothed with short, erect, black 

 bristles; under surface finely, densely punctured, finely pubescent; 

 legs piceous, the tarsi paler, the fourth [third] joint with a long lobe. 



