Oscarinus cabreroi, Dellacasa & Dellacasa & Gordon, 2013

Dellacasa, Marco, Dellacasa, Giovanni & Gordon, Robert D., 2013, Cephalocyclus majomaensis and Oscarinus cabreroi new species of Mexican Aphodiinae (Coleoptera: Scarabaeidae: Aphodiinae), Insecta Mundi 2013 (285), pp. 1-5 : 2-4

Oscarinus cabreroi new species

( Fig. 5-9)

Type locality. Cerro El Potosí, 24°52’28.1”N – 100°13’14.9”W, m 3274, Nuevo León, Mexico.

Type repository. Dellacasa Collection, Genoa, Italy.

Description. Length 4.0- 4.5 mm; shortly oval, strongly convex, shiny, almost glabrous. Blackish, clypeal margin, anterior angles of pronotum, base and preapical declivity of elytra shadowy brownish-red; legs brownish; antennal club piceous. Head with epistome moderately convex, irregularly punctured; punctation distally dense, coarse and somewhat confuse, proximally rather fine and sparse; clypeus faintly sinuate at middle, weakly denticulate at sides, very thinly bordered, edge feebly upturned, glabrous; genae angulose, scarcely ciliate, protruding from the eyes; frontal suture finely impressed laterally, almost obsolete medially, not tuberculate; front evenly, rather coarsely, not closely punctured. Pronotum transverse, convex, dually and somewhat irregularly punctured; large, coarse, faintly umbilicate punctures, five times larger than small ones, denser on sides, very sparse on disc; small punctures evenly scattered throughout, somewhat finer on disc; lateral margins feebly arcuate, thinly bordered, edge glabrous; hind angles obtusely round, base slightly bisinuate, distinctly bordered. Scutellum somewhat convex, finely, not closely punctured on basal half. Elytra strongly convex, rather elongate, almost subparallel-sided; striae rather deep, very superficially, not closely punctured, not crenulate; interstriae flat, finely sparsely, biseriately punctured, punctures denser and coarser on preapical declivity; lateral interstriae, toward apex, with extremely short sparse setae. Hind tibiae superior spur shorter than first tarsal segment; latter somewhat longer than following three segments combined. Male: head and pronotum relatively less densely and less coarsely punctured; fore tibiae spur somewhat stouter and more abruptly downward bent; aedeagus Fig. 8-9. Female: head and pronotum relatively more densely and more coarsely punctured; fore tibiae spur somewhat slender and regularly curved downward.

Type material. MEXICO: Chihuahua: Basaseachi , 28°13’00.9”N- 108°13’27.5”W, m 2037, 26.V.2005, leg. Dellacasa M., Fresi C., Martínez I., Cabrero F. & Trotta N. (2 paratypes, DCGI) ; Nuevo León: Cerro El Potosí , 24°52’28.1”N- 100°13’14.9”W, m 3274, 04.VII.2006, leg. Dellacasa M., Fresi C. & Martínez I., cow dung (holotype, male, allotype and 41 paratypes, DCGI; 2 paratypes, FSCA) ; Cerro Potosí, 10300’, 15-16.VII.1963, leg, Howden H. F. (3 paratypes, CMNO) ; idem, 12100’, 01.VI.1997, leg. Turnbow R. (5 paratypes, RHTC) ; idem, 54-55 km W Linares , 17.VII.1988, leg. Turnbow R. (2 paratypes, RHTC) ; Mpio. Galeana , Cerro Potosí, 24°52’18”N- 100°13’56”W, m 3720, 26.V.2005, leg. Carillo P., bosque de pino (1 paratype, DCGI) ; Galeana , Cerro Potosí, 04.VI.1983, leg. Kaulbara M. (5 paratypes, CMNO) ; idem, 10-12000’, 27.VI.1969, leg. Peck S. & J. (8 paratypes, CMNO, DCGI) ; idem, m 3750, 04.VI.1983, leg. Peck S. & J., summit litter Berlese (1 paratype, CMNO) ; San Luis Potosí: 10 km E Ciudad Valles , 24.VII.1988, leg. Turnbow R. (2 paratypes, RHTC) ; Sinaloa: El Palmito, 02.VII.1964, leg. Howden H. F. (5 paratypes, CMNO, DCGI) .

Distribution. Mexico (Chihuahua, Nuevo León, San Luis Potosí, Sinaloa).

Etymology. Named in honor of our friend and colleague Francisco J. Cabrero-Sañudo, Spanish scarabaeidologist.

Bionomics. Late spring and summer species feeding on cow dung, probably in sheltered areas.

Discussion. Oscarinus cabreroi is most similar to O. spiniclypeus (Hinton, 1934) . It can be easily distinguished from that species by the following key

1.

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Epistome coarsely punctured distally. Elytra very shortly and sparsely pubescent on preapical declivity, with interstriae distinctly punctured. Color blackish with clypeal margin, sides of pronotum, base and apex of elytra brownish red. Mexico (Chihuahua, Nuevo León, San Luis Potosí, Sinaloa) ..................................................................................... O. cabreroi new species

Epistome granulose distally. Elytra are glabrous, with interstriae almost imperceptibly punctured. Color entirely blackish. Mexico (Distrito Federal [Gordon and Skelley, 2007: 164], Guerrero and México) ......................................................................................... O. spiniclypeus (Hinton)