280 CHRIS. H. ROBERTS. 



exeept in the case of si(blliie(ifu.^, which species also shows the pecu- 

 liar surface sculpture aliove mentioned. In the female of that spe- 

 cies the penultimate abdominal segment is strongly sinuate, giving 

 it the appearance of being lobed at the middle, but the male shows 

 no corresponding character. 



The femora of the males in all the species, except vltfdiiis, Jioniu, 

 ui(/rior and «.s>//»///x, are furnished with a more or less distinct tooth, 

 and on the upper surface of the femora of all, male or female, will 

 be found a row of setigerous punctures varying in nundier and char- 

 acter. A certain amount of discretion is necessary in counting these 

 punctures, as a puncture is occasionally misplaced or entirely lost. 

 When one is missing a corresponding blank space is found, and when 

 there is an extra one it is crowded in close to another, placed entirely 

 out of line or in the hollow of the leg near its base, thus breaking 

 the regularity of the punctuation. The nundier, taken together with 

 their character, is of value in determining the species. 



The depressions in the elytra are situated, one at the exterior apical 

 angle, and the other at the suture near the apex. When the latter 

 is deep the elytra have the appearance of being elevated or humped 

 at that point. In the descriptions the characters of the male are 

 used unless special mention is made of the female, and as a rule the 

 female structure follows closely that of the male ; the legs are, how- 

 ever, more slender, and in those species which have the tibiae sub- 

 sinuate in shape the broadening is on the outer instead of the inner 

 side ; the femora usually have one more puncture. 



Four types of anterior tibiae are represented : first, the truly sinu- 

 ate, exemplified in vittati(>< and SHblineatus ; second, the subsinuate — 

 cylindrical at basal third, then rather suddenly broadened and con- 

 tinuing nearly parallel to apex — emarginatus, carolinus, productus, 

 serrulatxs and aua/is; third, the wedge-shaped — rather flat and 

 graduallv broadened from base to apex — honiii, iiujrior and a.-iKimUix ; 

 fourth, the club-shaped, somewhat cylindrical at base, not flat, and 

 thence gradually broadened to apex — discolor and augiistus. 



The elytra have nine slightly impressed strije, which ai-e sometimes 

 almost obliterated. The labrum is rounded in front and ciliated, 

 the scutellum is invisible, and the mesosternum is coarsely, but 

 sparsely punctured in front. In the males the anterior tarsi are 

 moderately dilated, and densely clothed beneath with papilke. 



A proper mounting of the specimens is of importance. The an- 

 terior legs should be spread out and depressed far enough to allow 



