228 AMERICAN COLEOPTERA. 



thorax, finely alutaceous, with the first four strise discernahle. the two inner 

 deeper, the third and fourth feebly impressed ; sutural stria deeper behind ; strife 

 impunctate; dorsal punctures distinct, the first about one-third from base, the 

 second about one-fifth from apex. Body beneath rufo-testaeeous. Legs testa- 

 ceous. Length .12 inch ; 3 mm. 



The anterior tarsi have the first two joints distinctly dilated in 

 the male. 



It is known to me by a single pair in the Horn collection. They 

 were sent to Dr. Horn under the name "pallidus Chd.," but the 

 different arrangement of the dorsal punctures forbids any associa- 

 tion with that species. In facies it resembles most nearly vorax 

 Lee, but is larger and broader, and differs also in the tarsal charac- 

 ters of the male. 



The specimens above mentioned are from San Estaban, Lower 

 California. 



38. T. pro vim iim Say (Plate VI, fig. 8). — Form elongate, subdepressed. 

 Head and thorax piceous, rarely tinged with rufous, the elytra testaceous, with 

 an ill-defined discal cloud slightly behind the middle dusky ; surface shining, 

 the elytra with more or less silken lustre. Head as wide as the thorax at apex ; 

 eyes large, prominent; antenna? nearly one-half the length of the body, pale 

 fuscous, the basal joint testaceous; palpi testaceous. Prothorax subquadrate, as 

 wide at base as apex, about one-half wider than long; apex truncate; anterior 

 transverse impression nearly obsolete, the posterior deep ; median line distinct, 

 abbreviated before and behind; basal impressions distinct; base truncate, 

 obliquely so each side; sides with the margin very narrowly reflexed, arcuate in 

 front, sinuate behind ; hind angles subrectangular, not carinate. Elytra oblong- 

 oval, elongate, with the two or three inner stria: distinct, the others feeble or 

 nearly obsolete, the sutural deeper behind ; first dorsal puncture about one-third 

 from base, the second about one-fifth from apex. Body beneath piceous, the 

 thorax slightly tinged with rufous. Legs testaceous. Length .11-. 13 inch; 

 2.75-3.25 mm. 



The males have the first two joints of the anterior tarsi dilated 

 (Plate VI, fig. 15). 



Quite easily recognizable from all the other species of the group 

 except scit a lus, which it resembles so closely that without both sexes 

 at hand it is often very difficult to separate them. The essential 

 difference between the two species is afforded by the tarsal charac- 

 ters of the male. A few comparative differences may be enumera- 

 ted, which are usually of assistance in identifying specimens. The 

 thorax in proximus is longer as compared with its width, with the 

 sides more or less sinuate behind, and, as a consequence, the hind 

 angles are less obtuse and more prominent. The form is slightly 

 more elongate and less depressed. In color the head and thorax 



