North American Coleopterous Insects. 



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their anterior canthi ; tip of the clypeus rather acutely 

 rounded: thorax somewhat abruptly -declining before, 

 with an obsolete, abbreviated dorsal line behind the mid- 

 dle, and a deeply indented, oval impression on the middle 

 of the lateral margin ; punctures small, very numerous ; 

 elytra with indented, punctured striae ; interstitial spaces 



convex. 



Length nine tenths of an Inch. _ 



Resembles C. CaroUnits, Fab., but is not so robust, and 

 the thorax is much less elevated behind. The horn of 

 the head, also, in CaroVmus is equidistant between the , 

 eyes and the tip of the clypeus. It is also like Nicanor 7 

 as figured by Drury I. pi. 35, fig. 1. 



2. C. incerta. Thorax simple, with an impressed line ; 



head' horned ; elytra striate. 



Inhabits Mexico. 



Body black, somewhat polished : head with dense, 

 shallow punctures ; a short, conic, vertical horn on the 

 middle ; tip of the clypeus acutely and rather deeply 

 emarginate : thorax punctured excepting on the posterior 

 disk ; a deeply impressed line from a little before the mitl- 

 dle to the base, and an impressed oval spot each side ; 

 anterior margin rather abrupt : elytra with deeply im- 

 pressed, crenate stnx ; interstitial spaces convex, irapunc- 



tured. 



Length nearly seven tenths of an inch. 



I should be inclined to consider this as the female of 

 ihe proddua, Nob. but in that species the larger horn is 

 very near the anterior termination of the head, and the 

 posterior horn is much shorter and remarkably inclined ; 

 whilst in the present insect no tubercle exists to mark the 

 locahty of the larger horn, and the horn that It possesses 

 is larger than the posterior horn of that insect, with 

 which it corresponds in locality but not in durectlon. 



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