80 LAMELLICOENIA. 



striatis, striis inconspicue punckdatis, interstitiis disperse punctatis; tibiis anticis curvatis, dente 4° 

 (superiore) subobsoleto. 

 Long. 11 millim. $ . 



Hab. Mexico, Oaxaca (Hoge). 



A single male. This species is allied to 0. hippopotamus, but differs in the carina of 

 the vertex being much elevated, and armed at each end with a longish upright horn ; 

 and also in the form of the thoracic anterior gibbosity, which forms in front an obtuse 

 bicurved carina, with a sharp vertical declivity to the fore margin of the thorax. 



35. Onthophagus hippopotamus. 



Onthophagus hippopotamus, Harold, Ann. Soc. Ent. Fr. 1869, p. 507 l . 

 Hab. Mexico, San Antonio de Arriba {Salle 1 ). 



36. Onthophagus semiopacus. 



Onthophagus semiopacus, Harold, Ann. Soc. Ent. Fr. 1869, p. 509 \ 

 Hab. Mexico, Juquila (Salle x ). 



37. Onthophagus Chevrolati. (Tab. VI. figg. 4, s ; 4 a, side view of head and 

 thorax.) 



Onthophagus chevrolati, Harold, Ann. Soc. Ent. Fr. 1869, p. 508 \ 



Hab. Mexico, San Andres Chalchicomula (Salle 1 ), Las Vigas, San Juan del Kio, 

 Zacualtipan, Salazar, Jalapa, Amecameca (Hoge). 



A male from Chalchicomula is figured. 



38. Onthophagus retusus. 



Onthophagus retusus, Harold, Ann. Soc. Ent. Fr. 1869, p. 509 \ 



Hab. Mexico, Parada (Boucard 2 ), Toluca, Yolotepec, Capulalpam (Salle), Oaxaca 

 (Hoge). 



This and the preceding species are acknowledged by Von Harold to be very closely 

 allied. I find on comparing specimens of each bearing labels in the describer's hand- 

 writing that the males exhibit the differences he specifies, which are, on O. retusus, the 

 less opaque, metallic, and more coarsely punctured thorax, the posterior carina without 

 distinct tubercle in the middle, the convex elytral interstices, &c. ; but in a large series 

 these characters are seen to be variable, and it is doubtful if the specific differentiation 

 can be maintained. 



39. OnthophagUS totonicapaniUS. (Tab. VI. figg. 5, 6 ; 5 a, side view of head 



and thorax.) 



O. chevrolati afflnis et similis, differt thorace ( S ) gibbere antico mediano angusto angulato. Fusco-niger, 



