NORTH AMERICAN COLEOPTERA. Ill* 



Laijru.m large, semi-oval, constricted before the middle, with three setae 

 on each side below the middle, and a curved row of smaller setae 

 towards the apex. 



Head m(jdorate, prominent. \ 



Pronotum rather small, not constricted. 



P^LYTRA very short, abruptly truncate ; epiplcnrn largely developed. 



Abdomen robust, pointed at the apex, with four long segments fully 

 exposed. 



Prosternitm moderate, falcate ; episfrnia distinct, very small ; eplnwra 

 rather large ; coxdl cariflcs contingent, enclosed behind. 



Mesosternum large, minutely carinate; episterna not reaching the 

 shoulders ; epimrra very large and broad, reaching to the coxal cavi- 

 ties. 



^Ietasternum large, extending to the sides; episterna and epimera 

 covered by the epipleura, posterior extremity of the latter only visible. 



Venter composed of seven segments, 1 twice as long as 2, 2-7 equal, 

 apex pointed. 



Legs rather long; femora, especially the posterior, robust; tibije slightly 

 dentate on the inner edge, tarsi 3-jointed, basal joint much larger than 

 the second, third long and slender, claws rather long and slender. 



Cox^ anterior nearly circular, contingent. 



INTERMEDIATE oval, separated by the carina. 



POSTERIOR rather small, prominent, widely distant, not laminated. 



C niibigena n. sp. — L. e. .53— .75 mm. — Elongate, oval ; very convex, shin- 

 ing, dark castaneous, sparingly clothed with silvery hair; head prominent, rather 

 long, labrum and palpi yellow; eyes small, not prominent; thorax rather larger 

 and wider than the head, widest near the middle: very shining, closely and finely 

 tuberculate, or alutaeeous ; sides rounded, faintly margined, basal margin nearly 

 straight, with the angles obtuse ; elytra short, shorter, but rather wider than the 

 head and thorax, widest behind the middle, rather deeply and remotely asperate, 

 with the interstices strongly reticulate; sides rounded, apex very broad, nearly 

 straight; abdomen conic, rather acute, with four segments fully exposed, pale 

 towards the apex; legs rather long, bright yellow; antennte moderate, dusky 

 yellow. 



Apart from its anatomical differences this insect may be known from 

 any species of PtineUa by its convex and corneous integument ; and the 

 aiirupt truncation of the elytra. 



This curious species was found by Mr. Champion on "' Totonicapam" 

 in Guatemala, at an altitude of 10,500 feet. 



From Ftinella this genus may be known by the very diverse form of 

 the antennae ; hard, corneous and convex integument, abrupt and straight 

 truncation of the elytra, and by the .seven ventral segments of the abdo- 

 men. 



