Deltorhinum batesi Harold, 1867

Génier, François, 2010, A review of the Neotropical dung beetle genera Deltorhinum Harold, 1869, and Lobidion gen. nov. (Coleoptera: Scarabaeidae: Scarabaeinae), Zootaxa 2693, pp. 35-48 : 39

Deltorhinum batesi Harold, 1867

(Figs. 3–7)

Harold 1867: 96 [original description; combination: Deltorhinum Batesi ] Harold 1869: 1003 [catalogue; combination: Deltorrhinum Batesi ]

Gillet 1911: 54 [catalogue; combination: Deltorrhinum Batesi ]

Luederwaldt 1931: 366 [mention; combination: Deltorrhinum Batesi ] Paulian 1938: 234 [mention; combination: Deltorrhinum Batesi ]

Blackwelder 1944: 205 [checklist; combination: Deltorrhinum batesi ] Vulcano & Pereira 1967: 533–603 [distribution; combination: Deltorhinum batesi ] Vaz-de-Mello 2000: 192 [checklist; combination: Deltorhinum batesi ]

Diagnosis. Differs from all other species in the genus by the simple, anteriorly lobate pronotum combined with the pygidium coarsely punctate basally.

Description. Holotype female: Body and legs reddish black to black. Clypeus strongly upturned medially; median projection narrow and truncate anteriorly; marginal bead concave and minutely microsculptured throughout. Gena sharply angular laterally. Frontal carina feebly bisinuous in dorsal view, median portion slightly lower than lateral portions. Vertex minutely punctate. Pronotal surface minutely punctate, punctures slightly larger on a small surface anteromedially, median longitudinal sulcus narrow and feebly impressed posteriorly, weakly defined anteriorly; anterior portion feebly lobate medially, lobate portion preceded by a small flattened area. Pronotal basal surface coarsely punctate on most of width along posterior edge, punctate area wider on median fifth. Elytral surface minutely punctate; striae fine and sharply defined, more deeply impressed on apical declivity, punctures transversal and encroaching on interstriae. Elytral epipleuron unmodified, hidden in dorsal view. Protibia with punctures scattered on dorsal surface. Profemur sharply carinate anteriorly. Mesofemora and metafemora simply convex ventrally. Mesotasi and metatarsi with first tarsomere as long as width at apex. Pygidial surface finely punctate apically, becoming larger and coarser on basal third; basal sulcus with some coarse umbilicate punctures; apical marginal bead weakly defined internally.

Measurements (2 specimens): body length: 9.0 mm.

Holotype Ƥ (MNHN): Ega (Bates handwriting) / Ex. Musaeo, E.Harold (printed) / Muséum Paris, ex. Coll., R. Oberthür, 1952 / WOLRD SCARAB. DATABASE, WSD00008007 / Holotype Ƥ, Deltorhinum batesi, Harold, 1867 , vid. F. Génier, 2008.

Material examined (13, 1Ƥ). BRAZIL: AMAZONAS, Ega [=Tefé], (3°22'S, 64°42'W), [no date], coll. [anonymous] - 1Ƥ (holotype) ( MNHN); RONDÔNIA, Ji-Paraná, Pimenta Bueno, (10°53'S, 61°56'W), ix.1938, coll. Vellard - 13 ( CEMT).

Natural history. Unknown.

Remark. I have studied a specimen, from Ji-Paraná (Rondonia), which I am tentatively assigning to this species. It is a very teneral male and it differs in having the abdominal segments basal surface less coarsely and widely punctate and in lacking the pygidial coarse basal puncture, somehow similar to D. guyanensis but the frontal carina is definitely as in D. batesi . This male specimen was dissected to extract the aedeagus. Unfortunatly, it was too teneral and the aedeagus was all shriveled and could not be illustrated.