206 AMERICAN COLEOPTEKA 



palpi testaceous. Prothorax scarcely one-half wider than long, as wide at base 

 as apex, subquadrate ; anterior transverse impression obsolete, the posterior deep, 

 finely punctulate, not tripunctate at middle: median line fine, abbreviated 

 1» lure and behind ; basal impressions distinct ; base truncate ; sides with the mar- 

 gin very narrowly refiexed, slightly arcuate in front, feebly sinuate behind ; 

 hind angles subrectangular, very finely carinate. Elytra elongate, nearly ellip- 

 tical, slightly wider than the thorax ; sutural stria deep, impunetate, the other 

 dorsal strife obsolete; first dorsal puncture slightly in front of, the second 

 slightly behind, the middle. Body beneath rufous or rufo-piceous. Legs testa- 

 ceous. Length .08-09 inch ; 2-2..") mm. 



So closely allied to the next species as in some instances to be 

 with difficulty separable. The only difference which can be relied 

 upon is to be found in the absence in rapax of the three punctures 

 at the middle of the base of the thorax on the posterior transverse 

 impression. These are present in audax, although more feebly 

 marked than in the other species in which they occur. 



It is known to me only from California and Arizona. 



10. T. audax Lee. 



This species resembles the preceding so closely as to require no spe- 

 cial description. In fact, apparently the only constant difference 

 between them is to be seen in the posterior transverse impression of 

 the thorax, which is feebly tripunctate at middle in the present spe- 

 cies, while it is not at all so in rapax. The punctures are less 

 clearly marked than in the other species in which the thorax is 

 similarly impressed, and, as the transverse impression is finely punc- 

 tate, both in this species and in rapax, great care must be taken in 

 separating them. In comparing the two it will be observed that in 

 the latter the sides of the thorax are usually slightly more sinuate 

 behind, and the hind angles consequently more nearly rectangular. 

 The difference, however, is not constant. The basal impressions of 

 the thorax are generally slightly smaller in audax than in rapax. 



From dolosas, which it closely resembles, it differs by the thorax 

 proportionally less wide at base than apex, the tripunctate trans- 

 verse impression, and by its slightly more convex form. 



In color it varies from rufous to rufo-piceous, specimens being 

 sometimes seen in which the elytra have a very ill-defined humeral 

 spot and another near the apex slightly paler. Its size is the same 

 as rapax. 



It occurs in California and Arizona, and examples have also been 

 seen from El Paso, Tex., and from Utah and Western Colorado. 



