-N BEETLES. 989 



- (•'. Head with a low. tnms^vei-se carina ; hiud tibiie truncate at tip 



and fringed with hairs. 



/. Mandibles toothed on the cuter side ; clypeus bidentate at tip 



(unidentate in one species). XXXI. Ligyrus. 



tf. Mandibles not toothed ; clypeus with an elevated three-toothed 



process just iefore the tip. XXXII. Aphonus. 



cr. Head with a long horn, male, or tubercle, female, on the vertex ; 



hind tibifB with several blunt, rounded teeth at tip. 



XXXIII. Xyloeyctes. 

 (Id. Size 40 or more mm. ; color greenish-gray with black spots (rarely 

 wholly piceous) ; males with the front feet elongated. 



XXXIV. Dynastes. 

 iia. Body elongate, tlattened; labial palpi inserted behind the mentum. 



XXXV. PniLEURUs. 



XXIX. CYCi.ucEPii.\LA Latr. 1829. (Gr., " circle + head.") 



Both this genus and the next have the head and thorax entirely 

 destitute of tuherclcs; clypeits flat, elongately rounded, finely mar- 

 gined; mandibles projecting taut slightly and not toothed on outer 

 side; basal marginal line of thorax not entire. In the males the 

 fifth joint of front tarsi is much enlarged and the antennal club is 

 usually longer than in the female. Three of the nine species of 

 Cijclocephala occur in the eastern United States and Indiana. 



KEY' TO INDIANA Sl'ECJEK OF CYCLOCEPIIAL.\. 



(I. (Alter front tarsal claw i.if male not cleft at apex; prosternuin convex, 

 not cariuate; last .inlnt of maxillary jialpus c.vlindrical ; head black- 

 ish. 1S47. NIGRICOI.LIS. 

 iKi. Outer front claw of male cleft (sometimes very slightly) at ajiex. 



h. Body smooth above; antennal club of male shorter tlian the otlier 



joints together. 1848. immaculata. 



lib. Body pubescent above ; antennal club of male longer than the other 



joints together. 1849. villosa. 



1847 (5861). Cyclocephala nigricollis Burm., Handb., V. 50. 

 Oblong-oval, robu.st. Pale brownish-yellow, shining; head blackish. 



Clypeus dull reddish, rounded in front, the margin reflexed. Thorax twice 

 as wide as long, sides broadly rounded, surface coarsely and rather sparsely 

 punctate. Elytra glabrous, coarsely and somewhat confluently i)unctate. 

 Length 11-13 mm. 



Putnam and Claris counties; scarce. July 5. Described from 

 Texas. Comparatively shorter, more robust and more shining than 

 our other two species. 



1848 (.58.''iS). C'vclocephala immaculata oliv., Ent., I, ITn!), 2'.). 

 Oblong-oval, moderately robust. Dull brownish-yellow, shining; front 



black, clypeus reddish-yellow. Thorax one-half broader than long, sides 



