DESCRIPTIONS OF NEW SPECIES. 77 



Body long ovate, pale brown, fringed at the sides with hair. 

 Head rather longer than wide, coarsely and densely punctured, 

 black, clypeus rounded, strongly margined; ante n use pale, '•'- 

 jointed, joints 3 — 5 closely united, club longer than the Btem. 

 Labrum very broadly and slightly concave. Thorax one-half 

 wider than long, considerably narrowed in front, strongly round< '1 

 on the sides, with a distinct marginal line in front; surface sparsely 

 punctured, yellow, with a very large transverse black spot, ex- 

 tending from the apex nearly to the base, where it is pointed. 

 Elytra strongly punctured, fringed at the sides with hairs. Be- 

 neath sparsely clothed with long hairs, tibia? and tarsi darker, 

 spurs of hind tibiae both movable, obtuse, claws armed with a 

 small tooth near the base. 



A species remarkable not only for the color of the thorax, but 

 by its anterior margin being thickened, and separated by a trans- 

 verse impressed line ; in Listrochelus the same marginal line is 

 seen, but to a much less extent. 



*ZHG. L,. nitidula. Elongato-ovata, testacea nitida, capite fuaco, for- 

 titer haud dense punctata, clypeo rotundato, marginato, apice obsolete 



sinuato, thorace flavicante, apice marginato, parce punctato later i bus 

 valde rotundatis, parce fimbriatis, elytris punctatia, margine paroe fim- 



briatis. Long. '45. 



Cape San Lucas; Mr. John Xantus, Also resembles a small 

 Cyclocephala. Smaller than the preceding, with the thorax more 

 narrowed in front, and more rounded on the sides, and the clypeus 

 broader and slightly sinuate in front. In the female the tooth of 

 the tarsal claws is more prominent ami near the middle of the 

 <daw. The antenna? of the male are as in the preceding. 



LISTROCHELUS Blanch. 



"2ST. L.. densicollis. Elongates cylindricus, piceo-rufas, capite the 

 rac'eque obscurioribus nitidis, iUo fortiter punctato, angustiua marginato, 

 anticelate subtruncato, fronte smturt bene impressa, thorace confertim 

 fortiter punctato, lateribus obtuse angulaUs, angulis posticia baud rotun- 

 datis; elytris vage punctatia, glauco-prninosis, tibiia posticia caUaribua 

 subaequalibus, tarsis tibiis paulo longioribus. Long. -62. 

 Cape San Lucas; J<»hn Xantus, Resembles in form L. mu- 



coreu8,but differs considerably by the characters above aoted. 



The sexual characters are as in that Rpecies. 



