AMERICAN COLEOPTERA. 241 



lateral margins; punctuation of the elytra about as strong as at the sides of the 

 pronotum, and not very variable in size. Metasternum finely sparsely punctate 

 throughout, the punctures a little stronger at the middle, surface alutaceous. 

 Eighth antennal joint broadly triangular, nearly as wide as long. Front tibiae 

 bisulcate; middle tibiae finely grooved along the hind margin. Length 1.75 mm. 



Hab. — New Mexico (Deming), Hubbard and Schwarz collection. 



22. C dispar n. sp. — Black, head and lower surface rufescent. Form mod- 

 erately robust, less than twice as long as wide, not narrowed posteriorly nor 

 gibbous in profile. Pubescence very fine and thin, but evident on the head and 

 pronotum, excessively sparse and short on the elytra. Head finely punctulate, 

 without intermixed coarser punctures, pronotum finely punctulate on the disk, 

 the punctures becoming distinctly coarser at the side margins; elytra coarsely 

 sparsely punctate, the finer punctuation entirely lacking, the surface minutely 

 reticulate but not dull. Metasternum sparsely, finely punctate from side to side. 

 Eighth antennal joint quadrate-triangular. Front tibiae bisulcate, middle tibia? 

 finely but rather deeply sulcate. Length 1.5 mm. 



Hab. — Columbus, Texas. Hubbard and Schwarz collection. This 

 is the smallest species in our fauna. It is somewhat similar to some 

 examples of nigritulum, but in none of these is the fine punctuation 

 of the elytra entirely lacking, and the pubescence is much better 

 developed. In dispar the pubescence of the elytra is almost as 

 nearly obsolete a*, in castaneum and politum, but these two species 

 are at once separable by their non-sulcate middle tibiae. Since 

 writing the above I have seen another example of this species taken 

 at Brownsville, Texas, by Mr. Barber. 



23. C. nigritulum Lee— Black, or piceous, form moderately robust, less 

 than twice as long as wide, not narrowed behind and scarcely gibbous in profile. 

 Puhescence sparse and very fine. Head and pronotum finely moderately closely 

 evenly punctulate, without intermixed coarser punctures, the punctures slightly 

 larger close to the side margins of the pronotum. Elytra finely numerously 

 punctulate, with scattered somewhat larger punctures, which are. however, not 

 very conspicuous. Metasternum finely sparsely punctate throughout. Eighth 

 antennal joint broadly triaugular. Front tibiae bisulcate; middle tibiae sulcate. 

 Length 1.7-2.4 mm. 



Hab. — Massachusetts (Tyngsboro, Blanchard) ; District of Co- 

 lumbia; Virginia (Roslyn) ; West Virginia (Berkeley); Ohio 

 (Cincinnati, Dury) ; Michigan (Grand Ledge); Tennessee (Mem- 

 phis, Soltau) ; Mississippi (Meridian); Indian Territory (Atoka, 

 Wickham) ; Texas (Columbus). 



The above description applies to typical specimens, but there is 

 much variation in punctuation of the elytra within what I have 

 assumed to be specific limits. The fine punctures may nearly dis- 



TRANS. AM. ENT. SOC. XXXI. (31) JULY. 1905. 



