Coleopterological Notices. 405 



pressed, the two fovesB separated by a strong thick and tumid carina 

 which becomes much less prominent toward base; this is also very 

 nearly the form in rufipes. 



This species differs from rufipes in antennal structure and in its 

 larger size, more robust and depressed form, more transverse pro- 

 thorax, much longer and more conspicuous abdominal setas and in 

 the structure of the penis ; the latter in rufipes is ver}" slender, 

 perfectly flat throughout and gradually acuminate, while in crassi- 

 cornis it is more robust and has a transverse tumid elevation on 

 the upper side at the apex. The second antennal joint in rufipes 

 is as long as the fifth and very nearly as wide in both sexes. 



ARGOPORIS Horn. 



The species found within the limits of the United States may be 

 separated as follows : — 



Elytra sulcate ; posterior femora of the male with a large acute tooth, the 

 edges of which are finely denticulate COStipenilis 



Elytra not sulcate, having very feebly impressed rows of deep perforate punc- 

 tures. 

 Upper snrface finely, strongly alutaceous ; posterior femora of the male with 

 a large bifid tooth, the edges of which are finely denticulate. 



alutacea 

 Upper surface polished. 



Head sparsely punctate, the epistoma strongly, transversely convex or 

 tumid ; hind femora of the male with two small, acute and exactly 

 equal teeth which are widely separated, the intervening edge straight. 



l»icolor 



Head densely punctate ; epistoma flat ; hind femora of the male with 



three equidistant teeth, the one nearest the base long, slender, very 



abrupt, the other two equal and very small nitida 



The species here described under the name alutacea, has been 

 confounded by Horn (Rev. Ten., p. 325) and Champion (Biol. 

 Cent.-Amer., Col., IV, i, p. 94) with bicolor Lee. On the plate 

 figures are given of the posterior femur of all the species included 

 in the table, and that of bicolor has been drawn directly from the 

 original type in the cabinet of LeConte ; this type corresponds 

 exactly with a large series in my own cabinet, collected near the 

 Mojave Desert, and I have never seen a specimen of bicolor which 

 was taken beyond the confines of California. 



