320 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Sexitypes in my own collection. 



Type-locality. — Santa Fe Canyon, New Mexico ; Prof. F. H. Snow, 

 collector. 



Salient type-characters. — More or less shining. Sides of the pro- 

 notnm evenly arcuate from base to apex, surface not very finely punc- 

 tate, punctures rather densely placed, denser laterally, where it is also 

 granulate. Elytra convex not distinctly flattened, although somewhat 

 so in the male; not very suddenly rounded, and inflexed laterally; 

 rather finely and submuricately punctate centrally; muricato-granu- 

 late laterally and on apex. 



Diagnostic characters. — In snowii the sculpturing is not strongly 

 muricato-granulate as in lecontci, where the elytra are more muri- 

 cato-tuberculately sculptured. In snowii the tendency is toward a 

 simpler form of muricate punctuation, and, besides, the form is 

 more elongate and the elytra usually moderately convex. Snowii has 

 not the facies of a planipeiinis ; typical lecontei has. 



The side margins of the pronotum are at times similar in snowii, 

 incidta, tenehrosa, and hornii. In incidta the body is much more 

 robust and the pronotum distinctly transverse, the elytral punctua- 

 tion is rather finely muricate; tcnehrosa is opaque and the elytra 

 sculptured with fine shining granules; /lornii has the pronotum more 

 narrowed at base, antenna? longer, humeri absent, and the elytra 

 slowly widening from the base. 



A series of specimens collected at Williams and along the Colorado 

 River in Arizona are more elongate than the types or other Ncav 

 Mexican specimens, and several of them have the pronotal sides dis- 

 tinctly and briefly sinuate in front of the basal angles. Others from 

 the same place, and taken at the same time, have the sides evenly 

 arcuate from apex to base; in every other respect they are identically 

 the same; one female is more robust and quite like a female from 

 Cloudcroft, New Mexico. Specimens from Colorado and New Mexico 

 also show this variation; tcnehrosa and inculta present analogous 

 variations. 



A female example collected at Oak Creek, Arizona, and before me, 

 is mor(^ robust, somewhat like a large variety of parvicollis, but 

 from some specimens of nigrina of similar facies it is almost impos- 

 sible to separate it, in fact it was impossible until I examined the 

 genital segment, which agreed exactly with those from Williams 

 and along the Colorado River. 



I have no hesitation in referring the above specimens to the present 

 species, as there is nothing to warrant me in separating them; the 

 genital characters agree. It might bo suggested that those specimens 

 with sinuate side pronotal margins approach consohrina, but the 

 latter is more robust in form and with coarser sculpturing and more 

 strongly punctate abdomen. I have never seen a true consohrina 



