318 COLEOPTERA OP NORTH AMERICA. 



Tribe IV.— CYRTIIVIIVI. 



This tribe is represented in the Atlantic States by a sinjrle 

 species of Cyrtinus (Clytus pygmetua Halcl.), and is very anoniu- 

 lous in its characters. 



The front is large, inflexed, somewhat convex, and the month 

 is small ; palpi slender, pointed ; eyes small, divided, coarsely 

 granulated; antennas a little longer than the body, scape slender, 

 without" apical cicatrix. Prothorax smooth, oval, very convex, 

 constricted at base ; elj'tra with rounded humeri, wider behind, 

 very convex, each with a large acute spine near the scutelltini. 

 Wings perfect. 



Front cox£e largo, rounded, cavities not angulated, closed be- 

 hind, prosternum scarcely longer in front than behind the coxje; 

 middle cavities slightly angulated, closed externally; legs stout, 

 thighs strongly clavate, middle tibias with a faint sinus on the 

 outer margin; hind tarsi shorter than the tibiae, 1st joint equal 

 to the two following, last joint rather large ; claws apparently 

 movable, as they are sometimes very widely divergent, and almost 

 divaricate, at others quite near together. The metasternum is 

 very little longer than the 1st ventral segment, and the intercoxal 

 process is acute. This is the smallest Lamiine in our fauna. 



Tribe V.— PSEIVOCERIIVI. 



Also represented by a single very small species of Psenocerus 

 in the Atlantic States (C'bjfuti supernotatus Say), whicli- resembles 

 a Saperda in its form, as much as Cyrtinus does a Dorcadion. 



The characters are nearly the same as in the preceding tribe, 

 except that the front coxse are angulated external)}^, and the 

 middle ones open; the middle tibise are absolutely without sinus 

 or tuft of hair on the outer margin ; the tarsi are wider, and the 

 last joint rather longer, and the claws very widely divergent, 

 though not divaricate. 



The front is large and vertical, the support of the labrum 

 coriaceous, the eyes coarsely granulated, divided, the antennce 

 shorter than the body; scape stouter, and less elongated, with- 

 out cicatrix, the 3d and 4th joints equal, longer than the others. 

 The prothora.x is cylindrical, convex, constricted at base ; elytra 

 cylindrical, each with an oval elevation near the scutellum, which 

 is much weaker in small specimens, humeri square. The body 



