T y p e m a t e r i a l: Holotype 3: " USA: NM: Socorro Co., South Mt. Baldy, N 33 95.100, W 107 11.165, 3136 m, baited pitfall trap, 14.08.201 5, leg. R. J. Buss " [coll. ES].

Paratypes: 233, 3♀♀ with the same data as the holotype [cES]; 233, 4♀♀ " USA: NM: Socorro Co.; N33.9849, W107.1861, S. Baldy Peak, pitfall, 21.08.201 5, leg. R. J. Buss " [3♀♀ in cES, 233, 1♀ cBU]; 13, " USA, New Mexico, Socorro Co., Magdalena Mountains, N33°59.100‘, W107°11.165‘, forest, pitfall trap, 30.VI.1998, leg. O. Fegyveres " [MNHM].

E t y m o l o g y: Named after Richard J. Buss, Albuquerque (USA), who collected the most of the type-specimens.

D e s c r i p t i o n: Male, hind wings absent, 2,2 mm. Body elongate, elytra broadest in the middle, pronotum 1,4 times broader than long. Pubescence light and fine, only with procumbent hairs. Punctation of the pronotum relatively fine, distance between the punctures in the middle of the surface like the diameter. Punctation of the elytra (basal third) like that of the pronotum. Eyes small but convex, head above the eyes wide as the pronotum between the anterior angles. Antennae slender, 11-segmented with a 3- segmented club (fig. 4). Pronotum 1,4 times broader than long, anterior callosity thickened, with a prominent tooth. Tooth on the margin of the pronotum in the middle, sides behind the tooth convex, in front of it strong concave. Elytra elongate oval, widest in the middle, humeral callus absent.

C o m m e n t: Quite characteristic wingless species. The shape of the pronotum resembles C. porrectus CASEY, 1900 (fig. 6) and C. varus WOODROFFE & COOMBS, 1961 (fig. 7), but both are fully winged. C. porrectus was found together with C. bussi in the same pitfall-traps. C. porrectus has a wide distribution throughout the USA.

D i s t r i b u t i o n: As far as known restricted on the Magdalena Mountains in New Mexico (fig. 8, 9 and 10). A wider distribution in the mountains ranges of New Mexico is conceivable, also in the neighbouring states.