Juneigoo,] CaSEY : On NoRTH AMERICAN COLEOPTERA. 55 



Csy.) differs from acuminata, among other minor characters, in hav- 

 ing finer and denser pronotal punctuation, while, as a fact, the pro- 

 notum is much more coarsely punctured in crassiconiis Csy. than m 

 acuminata. 



Chitosa gen. nov. 

 The type of this genus is Dinarda nigrita Rosh., which differs from 

 Dinarda, as represented by mdrluli and dentata, very profoundly in 

 antennal and tarsal structure, as well as in the entire form of the pro- 

 thorax and nature of the sculpture. In Dinarda dcntata the pro- 

 thorax is broadly and evenly bisinuate at base, and the sides near the 

 basal angles 'are parallel and nearly rectilinear, the antennce cylin- 

 drical, becoming somewhat acuminate at tip, and the basal joint of 

 the hind tarsi but little longer than the second, the first four joints m 

 fact diminishing only just visibly and quite regularly in length. In 

 ni-rita, on the other hand, the base of the prothorax is arcuate, becom- 

 ing emarginate at each side, and the side margin is emarginate near the 

 basal angles ; the antenna are gradually and strongly incrassate, a 

 form wholly foreign to Dinarda, and, finally, the hind tarsi are very 

 remarkable in structure and wholly different from any I have seen 

 elsewhere in the Aleocharini. The basal joint is thicker than the 

 remainder, darker in color or more highly chitinized, cylindrical and 

 lon-er than the next three joints combined, the latter short, gradu- 

 ally'' diminishing in length and obliquely truncate at their apices, the 

 fifth as long as the preceding three together and more slender. These 

 characters prove that Chitosa is a genus quite isolated from any other ; 

 it is however related to Dinarda. It occurs in Spain. 



SCAPHIDIID.E. 

 This family seems to be very much better represented in America 

 than in Europe, and a number of new forms have been discovered 

 since my revision (Col. Not., V.). 



Scaphidium Oliv. 

 The species before me seem to be five in number, piceum being 

 quite evidently distinct from the maculate forms ; they may be de- 

 fined as follows: — 



Elytra black, each with two pale subexternal spots •••■2 



Elytra uniform in coloration throughout, with a few d.scal coarse punctures m short 



4 



series 



