1880.] l'»^ [Horn. 



The only work in which the species of this genus has been treated as a 

 whole is by M. Putzeys (Stettin Zeitschrift, 1878, pp. 1 — 73), whose arrange- 

 ment, even with our small number of species, I have been unable to follow, 

 the primary division being rather inexact and the secondary characters not 

 easy to be perceived. There seems also to have been a tendency to exag- 

 gerate the importance of differences which are either individual or local 

 and the number of species unnecessarily increased. 



Since the reception of the above mentioned paper, material has gradually 

 been accumulated in our cabinets from all parts of the country, which 

 shows clearly that the species have a very wide range of distribution, and 

 the variations between widely separated localities are well marked, while 

 the differences become evanescent in intermediate localities. 



All the species belong to the Atlantic fauna, several however extend 

 through Arizona to the Peninsula of California, but none occur in the 

 true Pacific fauna, that is from San Diego northward. 



The following table gives in brief the characters separating the species 

 recognized in the subsequent pages : 

 Prosternum obtuse at tip, not margined. 

 Species with brpnzed surface lustre. 

 Intervals of elytra smooth, not pubescent, eighth stria not distant from 

 margin. 

 Elytra at tip feebly sinuate, the outer interval punctulate. 



Elytral punctures large, almost foveolate palliatus Fab. 



Ely tral punctures very small pedicularius Dej . 



Elytra at tip strongly sinuate, the outer angle subdentate. 



Outer interval not punctulate. .*. fatuus Lee. 



Intervals punctulate and pubescent, eighth stria more distant from the 



margin than from the seventh breviusculus, n. sp. 



Species black above, more or less iridescent. 

 Thorax as wide or wider at base than apex. 



Outer interval punctulate opalinus Lee. 



Outer interval not punctulate gagatinus Dej . 



Thorax distinctlj^ narrowed at base. 

 Hind angles obtuse . 



Marginal interval punctulate iripennis Say. 



Hind angles rectangular and prominent subtinctus Lee. 



Prosternum horizontal, tip slightly prolonged and margined. 

 Thorax not broader at base than apex. 



Form rather narrow, elytral punctures foveolate fossulatus Dej. 



Form broader, elytral punctures small ovalis Dej. 



Thorax broader at base than apex, sides nearly regularly arcuate from 



base to apex ellipticus Dej. 



The characters above given seem suflSciently plain to need no comment. 

 There have been no differences observed in the clypeal setigerous punctures, 

 all the species having but one puncture on each side. The males have the 

 anterior and middle tarsi moderately dilated, with two series of squamiform 

 papillae on the first four joints. 



