Paraplatylabus, Riedel, 2011

Riedel, M., 2011, Contribution to the Ichneumoninae (Hymenoptera, Ichneumonidae) of Southeastern Asia: 1. Tribes Clypeodromini, Listrodromini, Goedartini, Compsophorini, and Platylabini, Linzer biologische Beiträge 43 (2), pp. 1549-1572 : 1569-1570

Paraplatylabus nov.gen.

The species described below exhibits a characteristic combination of morphological features that prevents the incorporation in one of the known genera. In the key of Oriental Platylabini provided by HEINRICH (1974: 103-107) it runs to no 11: Platylabus and Pagarenes , and in the updated key of World Platylabini by TERESHKIN (2009: 1432- 1437) to Hirtolabus, but differs from these genera in many details (see below). Therefore I describe this genus as new.

D e s c r i p t i o n of Paraplatylabus nov.gen.

Flagellum long and slender, slightly attenuated beyond the middle, all flagellomeres longer than wide. Temples strongly narrowd behind the eyes. Clypeus moderately convex, its apical border almost straight in center and rounded at its sides. Malar space 0.6 times as long as the width of the mandibular base. Mandibles as in Platylabus .

Mesoscutum very densely punctured, slightly shining, notauli impressed anteriorly, but shallow, lateral margin of mesoscutum with a triangular elevation between tegula and scuto-scutellar groove (as in Platybirmania, but less pronounced), subalar prominence sharp, mesopleura longitudinally striate-punctured, metapleura densely punctured, without coxal carina. Scutellum distinctly elevated, wider than long, with strong lateral carinae, confluent as a transverse keel in the center. Propodeum punctured, with tooth-like apophyses, its spiracles oval about 2.0 as long as wide. Area superomedia hexagonal, twice as wide as long, costulae before the middle. Area posteromedia with irregular rugae, shining.

Coxae with dense rugulose puncture, hind coxa without scopa. Hind femur about 3.6 times as long as high, with superficial dense puncture.

Front wing with quadrangular areolet, 2mcu reaching areolet in the middle, nervulus postfurcal, nervellus broken in the apical 0.25, median parts of front wing with very scattered hairs, the submedian cell almost hair-less.

Metasoma amblypygous ( fig. 7, 9 ). Petiolus short and strongly flattened, about 1.5 times as long as wide, postpetiole strongly widened, almost twice as wide as long and about 0.8 times as wide as the distance of propodeal apophyses, with roundish spiracles that are almost situated on the dorsal side of the first tergite ( fig. 8 ), lateral carina distinct, but dorsal carina obsolet, median field with fine and irregular transversal striation. Second tergite 0.7 times as long as wide, gastrocoeli and thyridia strongly impressed, thyridia large, oblique, each about 2.5 times as wide as their interval ( fig. 7 ), second and third tergites densely punctured and granulate, matte, with distinct variolae, following tergites with superficial puncture and more or less shining, the seventh tergite with a distinct central nose-like elevation of the apical margin ( fig. 9 , as in the Palaearctic Platylabus histrio WESMAEL ).

The new genus shows the tongue-like elevation of the lateral margin of mesoscutum as described for Platybirmanica HEINRICH, but this elevation is less distinct in the new genus. The pattern of coloration and the structure of the second tergite resembles Platybirmanica acutinota HEINRICH. The new genus differs by its more or less straight apical margin of the clypeus, the different form of mandibles and an upper margin of pronotum that is not thickened as in Platybirmanica HEINRICH. Also, the structure of the the first and seventh metasomal tergites are completely different. The nose-like projec- tion at the apical margin of seventh tergite has only been found in the Palaearctic Platylabus histrio WESMAEL so far. From Platylabus WESMAEL the new genus differs by the structure of the first metasomal tergite as well as the different colour pattern.

Type species of this genus is Platylabus vietnamensis new species.

Figures

Figs 1-9: (1) Metasoma of the of Clypeodromus laoticus nov.sp., from dorsal; (2) Metasoma of the of Clypeodromus rarus nov.sp., from dorsal; (3) Metasoma of the of Listrodromus javae HEINRICH, from dorsal; (4) Face of the of Maraces rufothoracica nov.sp., from frontal; (5) Hind femur of the of Charitojoppa gracilis HEINRICH, from lateral; (6) Hind femur of the