Coelotrachelus Schmidt, 1913

Dellacasa, Marco, Dellacasa, Giovanni & Gordon, Robert D., 2009, Systematic revision of the genus Coelotrachelus Schmidt, 1913 (Scarabaeoidea: Scarabaeidae: Aphodiinae), Insecta Mundi 2009 (86), pp. 1-13 : 1-2

Genus Coelotrachelus Schmidt, 1913

Aphodius (Coelotrachelus) Schmidt, 1913: 140 ; Deloya and McCarty 1992. 6; Dellacasa and Gordon 1994: 153.

Coelotrachelus ; Dellacasa et al. 2001: 122 (new status); Gordon and Skelley 2007: 479; Skelley et al. 2007: 3 (checklist).

Type species. Aphodius kuntzeni Schmidt, 1913 (subsequent designation by Dellacasa 1988: 237).

Diagnosis. Medium size species (length 6.0-8.0 mm), elongate, moderately convex, shiny, glabrous. Piceous or brown-reddish or black. Head arcuately narrowed anteriorly; epistome feebly gibbous, very finely punctured; clypeus feebly sinuate at middle, obtusely denticulate at sides, not bordered, lateral margins elongately bristled; genae obtuse, ciliate, protruding more than eyes; latter small; frontal suture finely impressed, not tuberculate. Pronotum strongly transverse, flattened laterally; finely and irregularly punctured on disc, largely, irregularly and coarsely punctured on sides; latter S-shaped before hind angles, more or less narrowed toward base; hind angles obtusely dentiform; base thinly bordered or not bordered. Scutellum small, triangular. Elytra elongate, feebly widened posteriorly; striae fine, interstices nearly flat. First segment of hind tarsi shorter, as long as or distinctly longer than superior apical spur of tibiae. Fore tibiae distally tridentate and proximally not serrulate on outer margin; upper side sparsely, irregularly and finely punctured or smooth. Middle and hind tibiae with strong transverse carinae on outer face, apically fimbriate with spinules elongate and irregularly unequal. Pygidium with rather sparse, elongate and recumbent pubescence; its apical margin finely, sparsely and rather elongately ciliate. Sexual dimorphism shown in males by fore tibial spur hooked inwardly at apex and by relatively less convex pronotum. Aedeagus rather elongate, strongly sclerotized, parameres curved and acuminate apically. Epipharynx distinctly sinuate at front margin, rounded at sides; corypha protruding frontward with several stout apical spinules; epitorma conical; pedia densely and widely pubescent, with posterior rows of short chaetae; chaetopariae rather short and densely arranged.

Distribution. Southwestern USA and Mexico.