128 AMERICAN COLEOPTERA. 



TENEBKIOIDES Pall. 

 T. tenuistriata n. sp. 



Strongly depressed, intensely black above, surface alutaceous and 

 only moderately shining ; beneath black or blackish anteriorly, the 

 abdomen piceous or piceo-castaneous, legs and antennae rufo- to piceo- 

 castaneous. Prothorax not quite one-half wider than long, sides rather 

 widely margined, sinuate behind, hind angles rectangular, basal mar- 

 gin squarely truncate, punctuation as fine as in castanea. Elytra one- 

 fourth wider than the prothorax, evidently widest at middle, strial 

 punctures very fine, the striae scarcely perceptiby impressed, intervals 

 biseriately punctate. Length, 7-8 mm. ; width, 21-3 mm. 



Described from a series of four examples taken by the 

 writer at Las Vegas Hot Springs, New Mexico. 



This species is one of the most distinct in our fauna, being 

 approached by no other in the fineness of the elytral sculp- 

 ture. The squarely truncate hind margin of the prothorax 

 is also peculiar to it. 

 T. occidentalis n. sp. 



This name is proposed for a species occurring commonly 

 in the Southern Rocky Mountain region. It is most nearly 

 allied to corticalis and californica, but appears to be distinct 

 from both. As compared with corticalis it averages con- 

 siderably larger, the prothorax is more widely margined at 

 the sides and a little more coarsely punctate ; the interstitial 

 punctures of the elytra are also less fine, and the sides of the 

 elytra are a trifle less straight and parallel. The color is 

 almost never black, varying from castaneous to piceous, the 

 prothorax often somewhat paler than the elytra. The re- 

 semblance to californica is quite as strong, but in the latter 

 the form is a little stouter, the elytra a little less elongate, 

 the prothorax is also less widely margined, and the eighth 

 antennal joint is subtriangular and a little wider than the 

 seventh, while in occidentalis it is oval and not at all wider 

 than the seventh. Length, 7-9.2 mm. ; width, 2.6-3.3 mm. 



Specimens are before me from Boulder, Colorado ; Las 

 Vegas Hot Springs, Pecos and Cloudcroft (type), New 

 Mexico ; and Williams and Chiricahua Mountains, Arizona. 



T. debilis n. sp. 



Strongly depressed, piceous above or with the head, or head and 

 prothorax, castaneous ; beneath rufo-castaneous. Antenna? about as 



