ONTHOPHAGUS. 71 



Thorax dorso antice tubercnlis duobus porrectis elongatis compressis, fere bispinoso. Tibiae anticse elongatse, 



apice intus truncatae, penicillatfe. 

 $ . Caput punctato-rugosum ; clypeo late triangulari bidentato ; fronte carinata, vertice (sicut in $ 0. rhino- 



lopho) cornubus duobus erectis, basi baud carinata. Thorax dorso antice tuberculis duobus minoribus 



compressis. 

 Long. 7|-9 millim. 



Hab. Costa Eica (Van Patten) ; Panama, Bugaba (Champion). 



A transition form between the groups 0. rhinolophus and 0. sharpi ; but more nearly 

 allied to the former, from the species of which it differs only in the horns of the vertex 

 being reduced to very short conical tubercles ; and the thoracic tubercles, in compen- 

 sation, being greatly lengthened, so that they appear, viewed from above, like two 

 spines projecting much beyond the hind margin of the head. It is just possible that 

 a more developed form of the male exists, having posterior cephalic horns, but there 

 is none such in the fine series collected by Van Patten. 



We figure a pair from Costa Rica. 



11. OnthophagUS Sliarpi. (Tab. V. figg. 11, 6; lla, side view of head and 

 thorax; 12, $ .) 



Onthophagus sharpi, Harold, Col. Hefte, xiv. p. 138 \ 

 Hah. NicAKAGUA, Chontales (Belt) ; Panama r (Boucard), Bugaba, Caldera in Chiriqui 



(Champion). 



Belongs to a subgroup (including the four following species) in which the males have 

 a clypeal horn similar to that of 0. rhinolophus and its allies, but no trace of horn on 

 the vertex. 0. sharpi is deep glossy-black, with very scant punctuation. The male 

 presents similar gradations in the development of the horn to those described under 

 0. belorhinus. 



In the Salle collection is a female example (from Santecomapan, Mexico) very 

 similar to 0. sharpi in form and sculpture, but different in its rich metallic coloration, 

 the elytra being violet-black, the head and thorax golden-coppery, and the sternum 

 and femora brilliant aeneous. It would not be safe, in the absence of male examples, 

 to describe this as a separate species. 



We figure a pair from Bugaba. In rotten fruits and at sap (Champion). 



12. Onthophagus rostratus. 



Onthophagus rostratus, Harold, Ann. Soc. Ent. Fr. 1869, p. 511 \ 

 Hab. Mexico, Cuernavaca (Boucard \ in coll. Salle). 



13. OnthophagUS tapirus. (Tab. V. figg. 10, <s; 10 a, side view of head and 

 thorax.) 



Onthophagus tapirus, Sharp, Journ. Linn. Soc, Zool. xiii. p. 130 (<$ $ ) l . 



Hab. Nicakagua, Chontales (Belt 1 ). 



