344 COLEOPTERA OF NORTH AMERICA. 



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 flat. Oncidekes. 



Eyes very finely granulated, lower lobe not elongate ; 



Antennae with joints 1 — 4 thickened and hairy in % ; vertex deeply 

 concave. Taricanus. 



The first genus is represented by one species in the Atlantic 

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

 Thorns., a Mexican species which occurs in Texas. 



Tribe XII.— ATAXII1VI. 



Is represented in our fauna by Ataxia crypta (Say), (A. sordida 

 Hald.),-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 antennae are as long as the body, slender, annulated, scape 

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

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

 support of labrum coriaceous, mouth moderate in size, genae verv 

 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 

 coxae angulated, closed, presternum not abbreviated in front; 

 mesosternum truncate between the coxae, cavities angulated, but 

 scarcely open externally. Ventral segments, 1st and 5th a little 

 longer, 5th truncate at tip. Legs moderate, thighs feebly clavate, 

 middle tibiae without tubercle, hind tarsi with 1st joint nearly as 

 long as the two following, last joint as long as the first, ungues 

 approximate, divergent. 



Specimens from the Southern States and Texas have the elytra 

 obliquely subtruncate, and the hairs longer; in those from New 

 Mexico the elytra are almost rounded at tip, and the hairs are 

 shorter. I do not think these differences are of specific value. 



* Haldeman, Trans. Am. Phil. Soc. x, 52. 



t Erichson considered this insect as Saperda annulata and lineata Fabr., 

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



