CERAMBYCIDAE. 307 



Tribe XIII.— ATIIWIIXB. 



One genus with two species constitutes this group, which lias 

 lost entirely the characteristic form of the Cerambycinse, and 

 resembles a rather stout Lamiine. Tlie head is broad and short, 

 the front perpendicular; the eyes large, deeply emarginate, almost 

 in fact divided, and not very finely granulated; labruni transverse, 

 ciliated with very long hairs; mandibles slender and acute; 

 raentum trapezoidal, corneous; palpi unequal, scarcely compressed, 

 truncate at tip, the maxillary about half longer than the labial. 

 Antennas slender, shorter than the body in both sexes, 11-jointed; 

 2d joint less than half as long as the 3d, which is a little shorter 

 than the 4th, punctured and pubescent, not sericeous. Front 

 coxaB rounded, somewhat large, widely separated I)y the pro- 

 sternum, cavities not angulated externally, completely closed 

 l)ehind ; middle coxfB widely separated by the mesosternum, 

 which is truncate behind and gradually declivous in front; coxal 

 cavities slightly angulated externally, completely closed by the 

 sterna; metathoracic episterna moderate, neither wide nor nar- 

 row; metasternum unusually deeply emarginate behind, for the 

 reception of the acute intercoxal process ; ventral segments 

 slightly decreasing in length, the 5th in 9 a little longer than tlie 

 4th and truncate. Legs short, thighs moderately clavate, tibiae 

 with small s})urs, hind tarsi with 1st joint equal to two following 

 united. 



The scutellum is subquadrate, rounded behind; the mesonotum 

 has a large stridulating surface, divided by a dorsal furrow, as in 

 Lei)tura and allied genera. 



The body is densely clothed with long, coarse, lutcous hair, 

 with some denuded spots on the thorax and elytra; the former is 

 quadrate, transverse, scarcely rounded on the sides, and coarsely 

 punctured, the latter a little broader, truncate at tip, more finely 

 and very sparsely punctured, with several rows of very distant 

 larger punctures. The front tibiae are without any vestige of the 

 oblique groove seen in Lamia3. 



Atimia confusa (Clytus conf. Say) occurs in the Middle States 

 and Canada; and A. dorsalin Lee. on the Pacific slope. 



Tribe XIV.— DISTENIIiVI. 



This tribe, represented only by Dintenia inidala in our fnuna, 

 exhibits so many peculiarities that it may well be viewed as a 



