50 LAMELLICOENIA. 



Hah. Nicaragua, Chontales (Janson) ; Panama, Bugaba (Champion). 



A species differing in the form of the head from the typical members of the genus. 

 The punctures along the base of the thorax are not elongate as in Von Harold's Group L, 

 but small and rounded, and not forming a distinct margin. In some points of structure 

 the species approaches Scatonomus ; but the hind tarsi are not so broad and compressed 

 as in that genus, although the first and second joints are broader than usual in 

 Canthidium. 



ONTHERUS. 



Ontlierus, Erichson, Archiv fur Naturg. 1847,, i. p. 107 ; Lacordaire, Gen. Col. iii. p. 98. 



Nearly twenty species of this genus have been described ; it has a range similar to 

 that of the Canthidia, that is, restricted to the tropical and south temperate zones of 

 the American continent. 



1. Ontherus azteca. 



Ontherus azteca, Harold, Ann. Soc. Ent. Fr. 1869, p. 503 '. 

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



The type-specimen ( § ) in the Salle collection is the only one I have seen of this 

 insect. The species is rather elongate and robust, distinguished by the deeply 

 impressed and punctured dorsal line of the thorax. The clypeus is entire, and the 

 forehead armed with a conical tubercle as in the female of 0. sulcator (Fabr.). The 

 front of the thorax is declivous, with indications of two obtuse tubercles on the edge of 

 the declivity, and the sides present a reniform elevation below the fovea similar to that 

 of 0. quadratics. The metasternum is convex, furrowed down the middle, and strongly 

 punctured and reddish-hairy on the sides. 



2. OntherUS mexicailUS. (Tab. III. figg. 5, «? ; 5«, side view of head and thorax.) 



Ontherus mexicanus, Harold, Col. Hefte, iv. p. 80 (?) j Ann. Soc. Ent. Fr. 1869, p. 503 {$) \ 

 Hah. Mexico, Cordova (Salle *), Talacingo (Hbge) ; Costa Eica (Salle). 



3. Ontherus didymus. 



Ontherus didymus, Erichs. Archiv fur Naturg. 1847, i. p. 108 1 . 



<J . Oblongus, niger, elytris interdum subopalescentibus ; clypeo medio leviter emarginato, ruguloso, vertice comu 

 valido acuto ; tborace subtiliter sat dense punctulato, antice declivi et 4-tuberculato (tuberculis intermediis 

 approximate), linea dorsali obsoleta, fovea laterali extus leviter tuberculata; elytris punctato-striatis 

 striisque utrinque crenatis ; pygidio segmentoque ultimo ventrali crebre punctatis ; metasterno convexo, 

 lateribus sparsim punctatis ; tibiis anticis tridentatis. 



Var. 1. Cornu verticis elevato, lato, apice bifido ; tborace antice 4-tuberculato. 



Var. 2. Cornu verticis vix elevato, lato, binodoso ; tborace antice baud declivi, obsolete bitubereulato. 



Hah. Mexico, Oaxaca (Salle) ; Guatemala, Cubilguitz (Champion) ; Nicaeagua, 



