256 AMERICAN COLEOPTERA. 



Thorax without or in the female with at most a very feeble impressed median 

 line; male with one, slightly arcuate, long frontal horn, median pro- 

 tuberance of prothorax narrow, with the apical angles not divergent. 



arizoneiisis n. sp. 



5. Thorax dull, coarsely and very closely punctate, clypeus acutely incised. 



anaglypticus Say. 

 Thorax shining 6. 



6. Clypeus broadly emarginate, median prothoracic protuberance of the male 



broad, with apical angles divergent, frontal horn of male arcuate. 



remotus Lee. 

 Clypeus triangularly emarginate; median thoracic protuberance of male nar- 

 row, angles straight, not divergent, frontal horn nearly straight. 



inoechus Lee. 



The two species of Pinotus occurring in our fauna are only distin- 

 guishable from each other in the males. P. colonicus Say lias the 

 head in the male with two tubercles, and P. carolinus Linn, has the 

 head with one tubercle in the male, otherwise there does not seem 

 to be any difference. 



L,A€HNOSTERlVA Hope. 



The late Ottomar Dietz collected in Brownsville, Texas, a speci- 

 men of L. exorata Horn and also several specimens of L. ceqiialis 

 Lee, which I suspect to be the two sexes of one species ; the former 

 was described from the male, and the latter from the female. The 

 form of head and thorax, the sculpture, the very short, squamiform 

 hair in each puncture, and the more prominent upper tooth of the 

 front tibia are the same in both, the difference in form is exactly 

 like that seen in the two sexes of lanceolata Say. Taken all this in 

 consideration, and the fact that Dr. Horn did not have a specimen 

 of cequalis when he wrote his descriptions for the " Revision of the 

 species of Lachnosterna," I think there is very little doubt of the 

 correctness of my view, inasmuch as exorata looks strange in its 

 present place. 



The locality for L. heterodoxa and fucata was given by Dr. 

 Horn as "southern Arizona or possibly in Chihuahua." Of the 

 former I have taken several specimens at light in the Huachuca 

 Mountains, Arizona, and received of the latter one specimen from 

 Bisbee, Arizona, collected by my brother. 



The following species appear to be new, and their identification 

 will not cause any trouble, as they have strong characters which 

 separate them easily from their nearest allies. 



