304 LAMELLICORNIA. 



tion of the front edge, which in all other species is vertical. The mandibles are normal, 

 i. e. forming moderately narrow blades, with truncated apex and sinuated outer edge. 



III. Clypeus parvus ; mentum apice rotundatum vel rectum, integrum. 

 A. Antennae clava in s valde elongata. 



13. Cyclocephala immaculata. 



Melolontha immaculata, Oliv. Ent. i. 5, p. 29, t. 8. fig. 95 \ 



Cyclocephala immaculata, Burm. Handb. der Ent. v. p. 53 2 ; Horn, Trans. Am. Ent. Soc. 1871, 



p. 336 3 . 

 Cyclocephala lurida, Bland, Proc. Ent. Soc. Phil. 1863, p. 354 4 . 



Hab. Nokth America 2 3 4 . — Mexico 3 , Northern Sonora (Morrison), Villa Lerdo in 

 Durango (Hoge), Cordova (Salle). — West Indies, Guadaloupe 1 . 



14. Cyclocephala coahuilsB. (Tab. xvil. fig. 23, <? .) 



G. immaculatce afflnis et simillima ; differt elytris 5 medio margine laterali rotundato-dilatato et incrassato. 

 Mavo-testacea, vertice nigro, supra glabra ; clypeo sicut in 0. immaculata parvo, obtuse triangulari, rugu- 

 loso-punctato palpisque maxillaribus articulo ultimo cylindrico vix perspicue foveato ; tborace sparsissime 

 punctato, spatio dorsali laevi ; elytris striato-punctatis ; pygidio c? longe erecte piloso. Presternum ante 

 coxas obtuse carinatum, processu postcoxali alto apiee lato obtuso. c? . Antennae clava caeteris articulis 

 longiore. 5 • Antennae clava elongata, caeteris articulis paullo breviore. 



Long. 12-16 millim. $ $ . 



Hab. Mexico, Saltillo and Parras in Coahuila (Dr. Palmer). 



Almost the only difference between this species and C. immaculata rests, as in 

 C. sororia and C. frontalis, on a secondary sexual character, which must be of some 

 systematic as it is of physiological importance. In the numerous female examples of 

 C. immaculata examined from various localities the lateral margin of the elytra near 

 the middle shows no trace of dilatation or thickening. 



Five examples (three males, two females). 



15. Cyclocephala castaniella. (Tab. XVII. fig. 24, s .) 



O. immaculatce afflnis ; oblonga, supra glabra, castaneo-fusca, clypeo, partibus oris, antennis et pedibus fulvo- 

 castaneis ; clypeo parvo, semi-ovato, ruguloso-punctato ; tborace sparse, versus angulos posticos crebrius et 

 grossius, punctato, antice gradatim angustato, angulis posticis rotundatis ; elytris utrinque striis tribus 

 grosse punctatis geminatis flexuosis, interstitiis punctatis, limbo posteriore minute punctulato ; prosterno 

 antice sat anguste carinato, processu postcoxali alto. <f . Pygidium glabrum, margine fimbriato-punctu- 

 lato ; antennarum clava caeteris articulis conjunctis longiore ; tarsi antici ungue majore apice flsso. 

 $ . Elytra pone medium gradatim dilatato-explanata ibique margine incrassato ; pygidium glabrum, 

 politum ; antennarum clava sat elongata. 



Long. 12-15 miUim. <S $ . 



Hab. Costa Eica, Volcan de Irazu 6000 to 7000 feet (Rogers). 



A large number of examples ; without colour variation, except that the elytra in the 

 females are sometimes dark brown with the sides, or vaguely-defined spots, reddish- 

 castaneous. 



