CEKAMBYCIDAE, 329 



slender, last joint eyliiidi'ical, obtusely poiuted. The prostennun 

 is very short in front of the coxjb, prominent between them, 

 deelivous before and behind; niesosteruuni truncate between the 

 coxa3. Ventral segments equal in length, 5tli l)roadly emarginate 

 in both sexes, and impressed in the 9. Legs rather stout, equal ; 

 thighs moderately clavate, middle tibiie with a tubercle on the 

 outer margin, hind tarsi with the 1st joint broad, not longei" than 

 the 2d, last joint as long as the others united, claws approximate, 

 slightly divergent. 



Oncideres cingulatua is remarkable for placing the eggs in 

 small branches of trees, especially hickory, and then cutting 

 through the bark belov^', so as to kill the branch, which is after- 

 wards broken off by the wind ;* it will be remembered that 

 Elaphidion villosum has the same curious habit. 



Eyes not very finely granulated, lower lobe elongate; 



Antennae slender in both sexes, vertex Hat. Oncideres. 



Eyes very finely granulated, lower lobe not elongate ; 



Antennae with joints 1-4 thickened and hairy in "£ ; vertex deeply con- 

 cave. Taricanus. 



The first genus is represented by one species in the Atlantic 

 States, and two in Texas and Arizona; the second by T. Truquii 

 Thoms., a Mexican species which occurs in Texas. 



Tribe XII.— ATAXIIi\I. 



Is represented in our fauna by Ataxia n'ljpf.a (Say), (A. sordida 

 IIald.),f a slender insect densely clothed with mottled brown 

 and white pubescence, and remarkable for having the punctures 

 of the elytra arranged in rows, from which proceed black sub- 

 erect hairs. 



The antenine arc as long as the body, slender, annulated, scape 

 stouter, as loug as the 3d joint; joints from the 3d diminishing 

 very slightly in length. Front convex, rather broader than long, 

 support of labruni coriaceous, mouth moderate in size, geiue very 

 short; palpi slender, last joint acute. Prothorax as long as wide, 

 with a small, acute, lateral spine; elytra a little wider than the 

 prothorax, cylindrical, rounded or subtruncate at tip. Front 



* Ilaldeman, Trans. Annsr. I'liil. Soc, x. !'>2. 



t Erichson considered tliis insect as !<(ipfr(l(i onimhttd and lincata Fabr., 

 described from Soutli America. Vide Lacordaire, ix. 599. 



