?»36 G. n. HORN, M. D. 



C. puberula. Lee. New Species, p. 80. 



llesembles a Melolonthide of the Trichesthes group, and is our 

 smallest species. The anterior S spur is proportionately more slender 

 than in most of our species. The prosternum in front of coxae is 

 broadly convex and punctured and not carinate as in the preceding 

 species. Antennal club long. 



C. nigricollis, Burm. Handbuch, V, p. 50 ,• rohusta, Lee. New Species, p. 70. 



The synonymy has been determined by types sent me by Dr. Tjeconte 

 from Europe. It is the only one of our species in which the elytra 

 are brownish testaceous. The type of rohuAta is rather broader than 

 the other specimens and the difference is probably owing to the speci- 

 men having been accidentally flattened. The antennal club is here 

 also long and the last joint of maxillary palpus with but the merest 

 trace of an impression so distinctly visible in the preceding. No diffi- 

 culty need be found in distinguishing the three species forming this 

 sub-group. 



C. immaculata, Oliv. (Melolontha) Ent. I, 5, p. 29, pi. 8, fig. 95; Barm. (Cy- 

 clocephala) Handb. V, p. 53; nigrifrons, Panzer (Melolontha) Fauu. Am. Bor. 

 Prod. 1794; lurida, Bland. Proc. Ent. Soc. 1863, p. 354. 



This is our most abundant and widely diffused species and is found 

 from Illinois westward and southward extending even to x\rizona and 

 Mexico. It is consequently variable, those from the Texas region be- 

 ing broader and more robust and usually with a more decided surface 

 sculpture. This species is very closely allied to the following but may 

 be known by the pygidium being more feeble punctured and the hairs 

 very short. The hairs of the surface, when the specimen is fresh, are 

 also shorter and much less abundant. In immaculata^ the last joint 

 of maxillary palpus is very feebly impressed and the posterior eleva- 

 tions of the prosternum distinctly visible when viewed from the 

 front. 



C hirta, Lee. Proc. Acad. 1861, p. 346. 



The prosternal elevation behind the coxse is much shorter and more 

 obtuse at tip than the preceding species and scarcely visible when 

 viewed from in front. The maxillary palpi have the last joint feebly 

 impressed. This species is widely distributed in California. QMie spe- 

 cimens from the region of Fort Yuma are more elongate and the hairs 

 more deciduous. 



C. villosa, Burm. Ilandb. V, p. 54. 

 Closely allied to the preceding. The male has the antennal club 



