60 COLEOPTERA OF NORTH AMERICA. 



suture of the under surface of the prothorax is distinct, tlie others 

 are nearly obliterated; the prosternuui is broadly produced behind 

 the coxae, and obtusely rounded at tip; the coxa3 are not entirely 

 enclosed, but are protected behind by the mesosternum. The 

 latter is deeply concave behind, perpendicular in front, and is 

 almost covered by the prosternum when the thorax is deflexed. 

 The side pieces are diagonally divided, and the epiniera reach 

 the coxte, which are small and round. The metasternum is pro- 

 longed and obtusely rounded between the middle coxae, transversely 

 truncate behind; tlie side pieces are triangular, the epimera very 

 small; the posterior coxa3 are large, flat, rounded behind, extend- 

 ing to the margin of the body, internally contiguous for a space 

 nearly equal to the length of the metasternum, with a quadrate 

 internal dilatation for the insertion of the legs, as in Carabidae. 



The legs are slender, rough with granulated points; the anterior 

 tibije are not in the least degree sulcate internally, and have two 

 small terminal spurs ; the tarsi are glabrous, the joints rounded 

 bencnth; the claws simple. The elytra are twice as broad as 

 the thorax, connate, rounded, not very convex, with nine doi'sal 

 furrows, and no marginal one; the apex is slightly sinuate. 



The surface is rougli, without lustre, and moderately coarsely 

 punctured. 



Two species of Amphizoa occur in northern California, Utah, 

 and Vancouver, clinging to logs or stones under the surface of 

 streams. The genus was described under the name Dysmalhes 

 by Mannerheim, as a Tenebrionide. 



Fam. IV.— haliplidae. 



Mentum trilobecl, lateral lobes short, the median emargi- 

 nate or entire; ligula prominent, paraglossag lateral, short; 

 labial palpi with -last joint subulate (Haliplus) or conical 

 (Cnemidotus). 



MaxillaB bilobed, the outer lobe biarticulate ; palpi mode- 

 rate, the terminal joint as in the labial. 



Eyes rounded, entire. 



Antennte inserted on the front, before the eyes, under a 

 slight frontal ridge, 10-jointed, glabrous, filiform. 



Prothorax with distinct side pieces, the prosternum wide, 

 prolonged behind the coxae, the apex broad, the anterior 

 coxae rounded, their cavities open behind. 



