NEW BARK BEETLES — BLACKMAN 351 



Pronotum 1.08 times as long as wide, widest near base, posterior 

 margin weakly arcuate, posterior angles distinctly rounded; sides 

 subparallel on posterior half, slightly constricted in front of middle, 

 rather broadly rounded in front, anterior margin with only a few 

 low serrations; anterior area lighter in color, asperities rather nu- 

 merous, of moderate size, with moderate hairs; summit slightly an- 

 terior to middle, rather low; posterior area dark reddish brown, 

 weakly shining, reticulate, sparsely punctate-granulate, with short, 

 flattened, scalelike, cinereous hairs directed toward summit. 



Elytra equal in width to pronotum, and 1.92 times as long, 2.07 

 times as long as wide; sides subparallel on anterior four-fifths, 

 narrowly rounded behind, with a short sutural apex; surface mod- 

 erately shining; strial punctures small, shallow, in regular sub- 

 impressed, strial rows; interspaces narrow, rugulose, finely punc- 

 tate-granulate, each with a row of short, scale-like hairs, less nu- 

 merous and more slender than in opacicolUs. Declivity convex, 

 striae impressed, interspaces, except second, convex, granulate, with 

 spatulate hairs, slightly longer but no more numerous than on disk; 

 sutural apex small and inconspicuous. 



Fore tibia (fig. 8) of same type as in opacicolUs. 



The female is unknown. 



Type locality. — Santa Rita Mountains, Ariz. 



Host. — Unknown. 



Type Material.— Holotype, U. S. N. M. No. 56403. 



Described from a single specimen collected by H. F. Wickham. 



Genus THYSANOES LeConte 



TJnjsanoes LeConte, Proc. Amer. Phil. Soc, vol. 15, p. 369, 1876. — LeConte 



and Horn, Smithsonian Misc. Coll., vol. 26, No. 507, pp. 519-520, 1883 — 



Swaine, Canada Dept. Agr., Ent. Branch, Bull. 14, pt. 2, p. 82, 1918 — 



' Blackman, Mississippi Agr. Exp. Stat. Techn. Bull. 9, pp. 36-45, 1920; 



New York State Coll. Forestry Techn. Publ. 25, pp. 197-199, 1928. 



Genotype. — Thysanoes ftmbricornis LeConte. (Monobasic.) 



Aside from the genotype, three species have been described, 

 herchemiae Blackman and lobdelli Blackman from the southeastern 

 United States, and xylophagus Blackman from Arizona and New 

 Mexico. In the present paper three new species are described, two 

 from Texas and one from Mexico. 



KEY TO THE SPECIES OF THYSANOES LECONTE 



1. Larger, females 1.71-2.0 mm. long 2 



Smaller, females 1.39-1.55 mm. long 5 



2. Mature color yellowish brown ; frons with a small pit or fovea at 



center ; punctures of elytra finer ; antennal club narrow, first seg- 

 ment about one-third its entire length fimbricornis LeConte 



