THE LAMELLICOKN BEETLES. 



989 



e. Head with a low. transverse carina ; bind tibiae truncate at tip 

 and fringed with hairs. 

 /. Mandibles toothed on the outer side : clypeus bidentate at tip 

 funidentate in one species). XXXI. Ligyrus. 



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

 process just before the tip. XXXII. Aphonus. 



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

 bind tibiae with several blunt, rounded teeth at tip. 



XXXIII. Xyloryctes. 



M. Size 40 or more mm. : color greenish-gray with black spots (rarely 

 wholly piceous) ; males with the front feet elongated. 



XXXIV. Dyxastes. 

 aa. Body elongate, flattened; labial palpi inserted behind the mentum. 



XXXV. Phileurus. 



XXIX. Cyclocephala Latr. 1S29. (Gr> " circle - head. ") 



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

 destitute of tubercles ; clypeus flat, elongateiy rounded, finely mar- 

 gined : mandibles projecting but slightly and not toothed on outer 

 side; basal marginal line of thorax net 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 

 Cyclocephala occur in the eastern United States and Indiana. 



KEY TO INDIANA SPECIES OF CYCLOCEPHALA. 



a. Outer front tarsal claw of male not cleft at apex ; presternum convex, 

 not carinate; last joint of maxillary palpus cylindrical; head blaek- 

 isb. 1847. XIGRICOLLIS. 



aa. Outer front claw of male cleft (sometimes very slightly) at apex. 



6. Body smooth above: antennal club of male shorter than the other 

 joints together. 1848. immaculata. 



bJ>. Body pubescent above: antennal club of male longer than the other 

 joints together. 1849. villosa. 



1547 (5861). Cyclocephala nigricollis Burni.. Handb., V, 50. 

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



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

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

 punctate. Elytra glabrous, coarsely and somewhat confluently punctate. 

 Length 11-13 mm. 



Putnam and Clark counties: scarce. July 5. Described from 

 Texas. Comparatively shorter, more robust and more shining than 

 our other two species. 



1548 (5858). Cyclocephala immaculata Oliv.. Ent.. I. 17s0, 29. 

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



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



