Coleopterological Notices. 405 



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

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

 nearly the form in rxtfipes. 



This species differs from rvfipes in antennal structure and in its 

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

 thorax, much longer and more conspicuous abdominal seta; and in 

 the structure of the penis; the latter in rufipes is very 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 



AIK.OI'OIMS 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 surface finely, strongly alutaceous ; posterior femora of the male with 

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



altitacea 



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. 



tricolor 



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 llitida. 



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. 



