482 COLEOPTERA OF NORTH AMERICA. 



One species of Prionomerus and two of Piazorhinus are found 

 in the Atlantic States. 



Tribe XL— TYCHIINI. 



In this tribe a form of body is resumed, which resembles that 

 of the Erirhinini. The claws, however, are not simple, but ap- 

 pendiculate or toothed, and the second, third, and fourth ventral 

 sutures are not straight, but strongly angulated at the sides. The 

 prolongation backwards of the side angles of the second segment 

 is in some genera carried to such an extent ihat the points reach 

 the fourth segment, and the sides of the third segment are thus 

 entirely covered. The pygidium is usually exposed by the tips 

 of the elytra being separately rounded, but in Tychius they are 

 conjointly rounded, and the pygidium is covered. This character, 

 as in Anthonomini, possesses, therefore, but little value. The 

 ventral segments are less unequal than in Erirhinini. 



The other characters are those common to the preceding tribes: 

 Beak long and usually slender; antennas inserted far from the 

 tip; antennal grooves directed sometimes against the eyes, some- 

 times below them. The eyes are rounded or nearl}^ so, not finely 

 granulated. The funicle of the antennos is 6- or 7-jointed, and 

 the club entirely pubescent and annulated. The prothorax has 

 no postocular lobes; the prosternum is short, not strongly emar- 

 ginate in front, and the coxo^ are contiguous. The side pieces of 

 the mesothorax arc diagonally divided, and the epimera do not 

 largely attain the base of the prothorax. The metasternum is 

 long, and the side pieces ai'e narrow, or moderately wide, dilated 

 in front. TibiiB feebly or strongly mucronate ; articular surface 

 prolonged on the outer face, so as to become oblique. 



Our genera are as follows : — 



Angles of second ventral segment not extending to the fourth. 2. 



Angles of second ventral segment extending to the fourth. 5. 



2. Claws broadly appendiculate. 3. 

 Claws toothed. 4, 



3. Beak stout ; venter of % with acute processes. Proctorus. 

 Beak slender ; venter of % unarmed. Encalus. 



4. Beak slender ; fourth ventral suture indistinct. Thysanocnemis. 

 Beak stout, carinate. Plocetes. 



5. Elytra not tuberculate. i'. 

 Elytra tuberculate. Tylopteru.s. 



