Orthorhinus, Schoenherr, 1825

Kuschel, Guillermo, 2008, Curculionoidea (weevils) of New Caledonia and Vanuatu: Basal families and some Curculionidae, Mémoires du Muséum national d'Histoire naturelle 197, pp. 99-250 : 196-197

ORTHORHINUS genus group

DESCRIPTION. — Orthorhinus , a wide-spread genus of Australian, Oriental and Pacific regions is at present a disparate genus that contains several species groups, each deserving a separate generic status. Marshall (1932) proposed for the group the subtribe Orthorhinina within his Hylobiini , defining it as a full-winged weevil taxon whose species have a straight rostrum and disjunct fore coxae. This rather succinct characterization of Marshall included Ozoctenus Pascoe from the Neotropic, which, on external features alone, bears no relation to the other orthorhinines, differing from those of the west of the Pacific in having sclerolepidia, a completely dorsal uncus on all tibiae, a rudimentary or no comb accompanying the uncus, and sutural area between mesepisternum and mesepimeron flat, not impressed.

KEY TO THE ORTHORHINUS GENUS GROUP

1. Tooth on hind femora not distinctly larger than on middle femora, not ciliate, not crenulate or denticulate (Fig. 141) ........................................................................................................................................... 2 — Tooth on hind femora considerably larger than on middle femora, ciliate, usually also crenulate or denticulate (Fig. 142) .......................................................................................................................................... 3

2 (1). Fore tibiae strongly compressed, with sharp dorsal edge. Odd interstriae costate or tuberculate, usually with tufts of erect setae as well ................................................................................ Orthorhinus — Fore tibiae not compressed, dorsally blunt. Odd interstriae not costate or tuberculate, nor tufted with erect setae ............................................................................................................................. [ Allorthorhinus ]

3 (1). Hind tibiae, on lower edge, lacking a tooth basad from tufted premucral area ......................... 4 — Hind tibiae, on lower edge, with a sharply pointed tooth basad from tufted premucral area ........ 6

4 (3). Fore femora distinctly longer than hind femora. Fore tibiae not compressed, dorso-apically well-rounded, with oblique, ascending distal comb ..................................................................................... 5 — Fore femora shorter than hind femora. Fore tibiae moderately to strongly compressed, dorsoapically angulate, with transverse, non-ascending distal comb ....................................... [ Parorthorhinus ]

5 (4). Mesepisternum prominent, tuberculiform, sutural area between mesepisternum and mesepimeron deeply impressed. Fore tibiae with small premucro ......................................................... [ Faustius ] — Mesepisternum not prominent, not tuberculiform or tuberculate, sutural area between mesepisternum and mesepimeron not deeply impressed. Fore tibiae with large, bulky premucro .............. Dracophyllius

6 (3). Fore femora sublineal, not clavate, long, slender. Odd interstriae, before declivity, flat. Mesepisternum flat ................................................................................................................... Orthorhinoides — Fore femora swollen, clavate, short, robust. Odd interstriae, before declivity raised to low costae ......

..................................................................................................................................................... [ Homorthorhinus ]