918 



FAMILY I..- 



;;arab t:io e. 



species the thorax bears a process or protuberance in front, this 

 being most prominent in the male, where it varies greatly in de- 

 velopment, even in the same species. The clypeus and vertex usu- 

 ally each bear a transverse carina, these being more strongly marked 

 in the females. In all the males the front tibia? are much longer, 

 more slender and more curved than in the females. Five species 

 and three varieties have been taken in Indiana. 



KEY TO INDIANA SPECIES OF ONTHOPHACUS. 



ii. Thorax of male protuberant in front, frequently witli a long process 



more or less deeply emarginate at tip; protuberance in female very 



short but evident. 



6. Body black, opaque ; thorax finely granulate ; elytral intervals each 



with two rows of fine granules. 1734. hecate, 



66. Body bronzed or greenish, shining; thorax punctured; elytra not 



granulate. 1735. jands. 



aa. Thorax of male not differing from the female, both simply convex. 



r. Margin of clypeus distinctly notched, more acutely in female than in 

 male. 

 d. Base and apex of elytra with small paler patches ; thorax sparsely 

 granulate punctate. 1736. tubercdlifeons. 



dd. Elytra uniform purplish-bronzed ; thorax coarsely and deeply punc- 

 tate. 1737. CBIBBICOIilS. 



cc. Margin of clypeus feebly truncate at middle ; elytra wholly black. 



1738. PENNSYLVANICTJS. 



17.34 (5458). Onthophagus hecate Panz, Faun. Ins. Amer. Bor., 1794, 5, 

 pl. I, fig. 2. 



Broadly oval. Black, opaque; 

 sparsely clothed with short, grayish 

 hairs. Thorax rather densely granu- 

 late. Elytra finely striate, the inter- 

 vals with two or three rows of fine 

 granules. Males with margin of head 

 moderately reflexed, and elevated in 

 front in a slender triangular process; 

 the carinte of clypeus and vertex feeble 

 or absent; thoracic process variable in 

 form and length, often as long as the 

 thorax itself, broadly emarginate at tip 

 and with two small teeth extending 

 downward from the middle of the 

 emargination. Female w ithout the slen- 

 der process on front of clypeus; the 

 clypeal and vertical carina? strongly de- 

 veloped, the thorax slightly protuberant 

 at middle or with a feeble depression 

 each side of the middle of the front 

 margin. Length r)..')-9 mm. (Fig. 3G4.) 



Fig. 364. X 5. (After Forbes.) 



