CERAMBYCIDAE. 333 



Tribe IV. t YRTIMXI. 



This tribe is represented in the Atlantic States by a single 

 species of Cyrtinus ( Clytus pygmasus Hald.), and is very anoma- 

 lous in its characters. 



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

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

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

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

 constricted at base ; elytra with rounded humeri, wider behind, 

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

 Wings perfect. 



Front coxae large, rounded, cavities not angulated, closed be- 

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

 middle cavities slightly angulated, closed externally ; legs stout, 

 thighs strongly clavate, middle tibiae 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 

 moveable, 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 Lamiide in our fauna. 



Tribe V. PSENOC FRIAI. 



Also represented by a single very small species of Psenocerus 

 in the Atlantic States (Clytus supernotatus Say), which 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 coxae are angnlated externally, and the mid- 

 dle ones open ; the middle tibiae 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 antennae 

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

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

 The prothorax 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 



