72 LAMELLICOENIA. 



14. OnthophagUS nasicornis. (Tab. V. figg. 13, 6 ; 13 a, side view of head and 

 thorax.) 



Onthophagus nasicornis (Dej. Cat.), Harold, Ann. Soc. Ent. Fr. 1869, p. 511 \ 



Nigerrimus, politus ; thorace sparsim punctulato ; elytrorum striis punctato-crenatis, interstitiis parum convexis, 



sublsevibus ; pygidio crebre punctate 

 c? . Clypeus sub triangularis, medio apice eornu erecto laminiformi apice haud dilatato ; vertice haud cornuto. 



Thorax antice verticalis tri-impressus, dorso anteriore quadrato-gibboso. 

 2 . Clypeus bidentatus vel apice profunde fissus ; carina frontalis brevis, transversa. Thorax convexus. 



Hah. Mexico 1 , Cordova, Tuxtla (Salle). 



The head in the male is narrower than in the preceding species, the gense not being 

 greatly dilated, and their outline continuous with that of the clypeus up to the base 

 of the horn. 



15. OnthophagUS dicranius. (Tab. V. figg. 14, <$ ; 14 a, side view of head 



and thorax.) 



Parvus, fusco-niger, subnitidus, cupreo-tinctus, pedibus rufo-piceis ; capite thoraceque grosse sat confertim 



punctatis ; elytrorum striis valde crenato-punctatis, interstitiis rugulosis et sparsim punctatis. 

 $ major. Clypeus apice cornu erecto laminato furcato armatus, apice obtuse truncatus, margine leviter fiexuoso. 



Thorax dorso anteriore medio bituberculato, tuberculis altis, compresso-conicis. 

 c? minor. Cornu clypei abbreviatum, apice obtusum. 



$ . Clypeus bidentatus, capite supra piano, carina frontali brevissima, obsoleta. 

 Long. 5-6 millim. 



Hab. Panama, Bugaba (Champion). 



The two conical tubercles of the thorax in fully developed males are greatly 

 elevated and porrected, forming a bicuspid protuberance which overhangs the hind 

 margin of the head. In the minor males they are scarcely more elevated than the 

 thoracic tubercles of 0. rhinolophus. 



16. OnthophagUS mexicanUS. (Tab. V. figg. 15, 6 ; 15 a, side view of head 

 and thorax.) 



0. latebroso (Fabr.) afflnis, sed differt corpore supra fere calvo etc. Subopacus, atro-caeruleus vel violaceus, 

 interdum viridis, raro cupreo-auratus ; thorace subtiliter disperse punctulato, medio basi lseviore ; elytris 

 subtilissime punctulato-striatis, interstitiis planissimis, punctulatis, punctulis brevissime setiferis ; antennis 

 nigro-clavatis ; clypeo ( c? $ ) medio apice obtuso truncato, sinuato, supra c? lsevi, $ punctato-rugoso, 



J major. Caput margine utrinque valde fiexuoso bilobato, clypeo lato et valde reflexo ; carinis transversis 

 duabus, anteriore subtili transversa, posteriore arcuata utrinque in cornu acuto producta. Thorax antice 

 verticalis profunde bi-impressus ; dorso medio antice valde prolongato, furcato. Tibiis anticis elongatis, 

 apice intus acute productis. 



<$ effceminatus. Capitis margine laterali minus fiexuoso, carinis validioribus, posteriore utrinque haud 

 prolongata. Thorax dorso antice parum producto, quadrato-lobato, lobo antice leviter emarginato. Tibiis 

 anticis apice intus acutis. 



$ . Fere sicut in S effoeminato ; differt thoracis lobo anteriore minus producto haud emarginato tibiisque 



anticis intus apice simplicibus. 

 Long. 7-10 millim. 



