NEW NORTH AMERICAN PSELAPHID^. 469 



excavation being anteriorly arcuate and extending under the 

 apical process of the first; at the apex there is in the mid- 

 dle a strongly elevated carinate tubercle which is slightly 

 transverse, with the apex directed anteriorly for a slight 

 distance over the excavation, and bearing two fine setiform 

 appendages; its posterior surface is feebly and minutely 

 tuberculate; the surface of the segment has, at each side 

 of the central excavation, a transverse arcuate canalicula- 

 tion which is disconnected. The third segment has, just 

 before the middle, two small tubercles distant by nearly 

 one-half the width, the remainder of the surface being un- 

 modified. Fourth segment unmodified. Fifth shorter, 

 feebly produced in the middle. 



The under surface, as in cinclnncda, consists of but three 

 visible segments, the first being very long, the third ab- 

 ruptly and narrowly deflexed in the middle, the deflexed 

 portion being channeled externally. There is, however, a 

 fourth segment to be seen by looking longitudinally under 

 the third, by which it is entirely covered. The surface of 

 this fourth segment is abruptly arched at each side between 

 the middle and the lateral edges, the arching being visible 

 as a semicircular emargination of the edge when viewed 

 longitudinally, and there is on the edge in the middle a 

 strong vertical spine which appears to fit into the 

 channel in the deflexed apex of the third segment. 



These species belong near tomentosa Aube, but appear to 

 be smaller and more sparsely pubescent. The genus is al- 

 most exclusively confined to the sea-beaches of the Atlantic 

 coast. 



TYCHUS Leach. 



T. SOnomae n- sp. — Sleuder, convex, piceous; elytra, legs and antennae 

 testaceDUs; pubescence fine, moderate in length, sparse; integuments pol- 

 ished, impunctate. Head much narrower than the prothorax, distinctly 

 longer than wide, broadly rounded behind the eyes; the latter rather large, 

 prominent, coarsely granulate, at nearly their own length from the base: 

 surface transversely convex, transversely impressed behind the frontal 



