COLEOPTERA. 431 



Chasme, Lepel. and Serv. 



The Chasmes only seem to differ from the preceding Insects in 

 the hooks of the two posterior tarsi, the largest of which is alone 

 bifid(l). 



There, the posterior thighs, at least in the males, are very large 

 and dentated, their tibiae thick and terminated by a strong hook. 



Dicheles, Lepel. and Serv. Melolontha, Fab. Oliv. 



The body is short, but slightly pilose, and the elytra are narrowed 

 towards the extremity, forming an elongated triangle. The poste- 

 rior legs are partly contractile. All the hooks of the tarsi are equal 

 and bifid. The terminal lobe of the maxillae is dentated along its 

 inner margin, as in Hoplia, to which this subgenus closely ap- 

 proaches^). 



Sometimes the two posterior tarsi have but a single hook those 

 of the others are unequal and bifid. 



Some, like the preceding, have but nine joints in the antennae. 



Lepitrix, Lepel. and Serv. Trichius, Melolontha, Fab. 



The body short; thorax narrower than the abdomen, nearly square, 

 and slightly narrowed posteriorly; abdomen broad and posterior legs 

 large; last joint of the maxillary palpi much longer than in the pre- 

 ceding subgenera; terminal lobe of the maxillae very small and in 

 the form of a short triangle(S). 



The others have ten joints in their antennae. 



The body is short and densely pilose; the epistoma forms an elon- 

 gated triangle, truncated or very obtuse at the end; the salient palpi 

 are terminated by a long and cylindrical joint; the maxillary lobe is 

 long, narrow, salient at the extremity and destitute of teeth; the 

 abdomen large, and the posterior legs long. 



Pachycnemus, Lepel. and Serv. Melolontha, Trichius, Fab. 



The elytra narrowed near their extremity, thighs and tibiae of the 

 two posterior legs inflated, the latter almost clavate, with one of the 

 two extreme spurs much stouter than the other. 



Anisonyx, Lat. Melolontha, Fab. 

 The elytra forming a long square, rounded posteriorly; posterior 



(1) Encyc. Method., article Scarabeides. 



(2) Ibid., idem. 



(3) Ibid., idem. 



