Peracca (Robustacca), Ingrisch, 2020

Ingrisch, Sigfrid, 2020, New subgenera and species of Agraeciini (Orthoptera, Tettigoniidae, Conocephalinae) from South Asia found in historical insect collections, Evolutionary Systematics 4 (2), pp. 119-132 : 119

Robustacca subgen. nov.

Type species.

Odontoconus robustus Karny, 1923.

Etymology.

The name of the new subgenus is built from a combination of the root of the name of the type species with the ending of the genus name.

Diagnosis.

The stout general habitus of the new subgenus and the rather high lateral lobes of pronotum resemble the situation in the genus Liara , but the spine behind the ventro-anterior angle of pronotum, the strongly modified male cerci and the absence of sclerotized titillators agree with the genus Peracca . The new subgenus contains stout, robust species with large head. - Head and pronotum rugose. Fastigium verticis with a dorsal process. Pronotum with lateral lobes rather deep compared to other subgenera of Peracca , less than twice as long as high; at ventral margin with a small spine behind anterior angle. Fully winged, wings surpassing abdomen but not reaching tip of ovipositor in female. Tegmen markedly narrowed in apical third. Prosternal spines long with acute tip. The male cerci have the internal branch prolonged and curved backward at end, the apical process is laterally compressed and pointing straight behind instead of being downcurved as in the subgenus Peracca Odontoconus , it is provided with spinules along dorsal margin but is missing a narrow ventral branch that occurs in most species of the subgenus Peracca Odontoconus . A so far unique character is the markedly narrowed prolongation of the male subgenital plate that is divided and upcurved at end and has the styli reduced to small and short, acute conical spines while in all other subgenera of Peracca s.l. the males have subgenital plates with truncate or slightly concave apical margin and with distinct, normal styli.

Species included.

Peracca (Robustacca) robustus (Karny, 1923) comb. nov. and Peracca (Robustacca) nigrifrons sp. nov.