158 PROC. ENT. SOC. WASH., VOL. 22, NO. J , OCT., 1920 



finely, sparsely and transversely punctato-rugose, shining. Femora less 

 strongly swollen. 



Length 11 mm.; width 3.2 mm. 



Type Locality. Maxwell, New Mexico. D. J. Caffrey, col- 

 lector. 



Type. Cat. No. 22824, U. S. Nat. Mus. 



Described from five specimens, three males and two females, 

 collected by D. J. Caffrey, July 21, 1916, under bark of Cedar 

 (Juniperus sp.). 



Two of these paratypes, male and female, differ from the type in 

 being much smaller, only measuring 7 mm. in length. This is prob- 

 ably due to the lack of food, causing the larvae to pupae pre- 

 maturely, which is often the case in the family Cerambycidae. 



This species belongs to the group, including the species which 

 have the antennae and prothorax differing very little in the sexes. 

 It can be easily distinguished from any of these species by its 

 wedge-shaped form, the elytra being distinctly narrowed from 

 base to apex. 



Ataxia arizonica, new species. 



Elongate, parallel, piceous black, sparsely clothed with recumbent whitish 

 and brownish ochreous pubescence, tending to form irregular, indistinct lines 

 on the elytra, with rather thick, semi-erect black setae arising from the elytral 

 punctures. Head finely, densely punctate, with a few coarser and deeper 

 scattered punctures intermixed, about as wide as long, feebly convex in front 

 and moderately impressed between the antennal tubercles. Antennae nearly 

 one and one-half times as long as the entire body (cf ), about as long as the 

 body ( 9 ); first joint four-sevenths as long as the third, clavate; joints three 

 and four sub-equal in length; joint five a little longer than four and sub- 

 equal in length to the seventh, eighth and eleventh; ninth and tenth joints 

 a little shorter than the eleventh; the joints very feebly annulated at base, 

 densely pubescent, with fine, short, whitish and brownish hairs intermixed 

 with long, sub-erect ones. Prothorax about as wide as long, feebly narrower 

 at base than apex; sides slightly arcuate with a feeble tubercle at middle; 

 surface densely punctate with a few larger punctures intermixed, pubescence 

 dense, nearly concealing the surface sculpture, except an elongate space at 

 the middle, which is denuded. Elytra three times as long as the prothorax 

 and only a little wider than it at the base; humerals rounded; sides nearly 

 parallel; apices sub- truncate; surface with rows of irregular, moderately coarse 

 punctures, becoming coarser and more confused behind the scutellum. Scutel- 

 lum triangular, rounded behind, pubescent. Beneath and legs densely clothed 

 with white and ochreous pubescence. Front coxae angulated, closed behind, 

 and moderately separated. 



Length 10-12.5 mm.; width 2.2-3 mm. 

 Type Locality. Sabino Canyon, Arizona, Geo. Hofer, collector. 



Other Localities. San Simon, Arizona, Hubbard and Schwarz, 

 collectors. 



