476 COLEOPTERA OF NORTH AMERICA. 



bilobecl, and the hind tibi« truncate at tip, not unguiculate, but 

 only feebly mucronate, with the articular surface terminal. The 

 tarsi are either broad or narrow, the third joint sometimes but 

 slightly dilated, and the last joint long, with large divergent claws. 

 The body is narrow, covered with a dense water-proof crust of 

 scales, as in Cryptopli and Hydronorai. The beak is straight, 

 cylindrical, moderately stout, and as long as the prothorax; the 

 antennal grooves run directly to the eyes and converge but 

 slightly behind ; they commence at a varying distance from the 

 mouth. Tiie antennae are slender; funicle 7-jointed, first and; 

 second joints elongated in our genera, 3-7 gradually broader, 

 club oblong-oVal, annulated, entirely covered with sensitive sur- 

 face. Prothorax with large postocular lobes, prostcrnum deeply 

 emarginate beneath, not excavated. Legs long, slender, thighs 

 moderately clavate, front and middle tibiae slightly sinuate, all 

 are very feebly mucronate at tip ; tarsi with 3d joint broad, deeply 

 bilobed in Anchodemus, narrow, slightly emarginate in Lixellus. 



Tibire not serrate on the inner side. Anchodemus. 



Front and middle tibite serrate. Lixellus. 



The species have been found in the Atlantic region, but Lix- 

 ellus extends to Nevada. They have a general resemblance to 

 the European genus Lyprus, which, however, has strongly ungui- 

 culate tibiae and nearly filiform tarsi. 



Group VII. — Hydronomi. 



The same varnish-like covering noticed in the three preceding 

 groups is retained in this, the species of which are also found on 

 plants near water. Tl>ey are easily distinguished by the longer 

 and more slender legs, the tibiae curved, and frequently serrate 

 on the inner side and strongly hooked at tip. The tarsi are 

 usually slender, the third joint frequently not dilated, and the 

 la.si joint moderate or very long, with stout, simple, divergent 

 claws. The prostevnum is usually broadly sulcate. 



Our genera may be tabulated as follows: — 



Club of antennae entirely sensitive. 2. 



Club of antennre partly smooth and shining ; prosternum not excavated. 



Lissorhoptus. 



2. Prothorax feebly constricted in front. Bagous. 



Prothorax very strongly constricted in front. Fuigodes. 



