386 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



length and increasing in breadth. Prothorax broader than long, 

 basally and apically truncate, laterally very convex; ocular lobes 

 moderate with very short fimbriae; disk densely punctate-tubercu- 

 late, vestiture sparse. Elytra elongate, sides almost parallel; humeri 

 small but strongly angulate, wider than prothorax at base; intervals 

 broad, slightly convex, densely squamose and pilose; strial punctures 

 large, round, separated, setigerous; striae not impressed. Undersides 

 densely, confusedly, and shallowly punctate ; sparsely squamose, the 

 scales narrower than above, sparsely pilose, the hairs finer thai; above. 

 First ventral suture angulate at middle; second segment not longer 

 than third and fourth together. Tibiae mucronate and denticulate, 

 the posterior apically with a single row of spines. 

 Type.— Cat. No. 14636, U.S.Nat.Mus. 



Genus DYSLOBUS LeConte (1869). 



Dyslobus LeConte, Ann. Mag. Nat. Hist., 1869, p. 380. 



Amnesia Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 48 (typical part). 



The t3r]3e of Dyslohus was designated by Horn (1876) as segnis 

 LeConte. The type of Amnesia as originally designated was grani- 

 collis LeConte. 



It is no longer possible to separate these genera as distinct. 



Table of species of Dyslobus. 



I. Funicular joints elongate; large species usually over 8 mm. long. 

 1. Elytral intervals alternating in convexity. 

 a^. Serial punctures setigerous (Amnesia proper). 



bK Elytra sparsely but strongly tuberculose throughout, the sutural prominence 

 at the summit of the apical declivity very pronounced; anterior tibiae 



denticulate tumidus Casey. 



b^. Elytra not tuberculose. 

 c^ Sutural prominence of elytra moderate or feeble. 



d'. Terminal spur of posterior tibiae long, stout, and prominent; body oval, 

 rather robust at least in the female; all tibiae denticulate. 



granicollis LeConte. 



d'. Terminal spur of posterior tibiae very small, nearly obsolete; body 



narrow and elongate at least in male; antcnnal scape very long and 



slender, slightly passing the posterior margin of the eye; anterior 



tibiae strongly denticulate. 



e^. Legs black, anterior femora distinctly elongated in the male. 



discors Casey, 

 e-. Legs red, the anterior femora not elongated in the male. 



sculptilis Casey. 

 C-. Sutural prominence strong, doubly tuberculate; anterior tibiae denticu- 

 late bituberculatiis, new species. 



fl-. Serial punctures equamigerous; all tibiae denticulate; sutural prominence of 



elytra keeled denticulatus , new species. 



1. Elytral intei-wals not alternating in convexity throughout their length; anterior 

 and median tibiae denticulate {Dyslobus proper), 

 a'. Serial punctures squamigerous; elytral suture prominent and keeled near the 

 the summit of the posterior declivity. 



