Megalomya albomaculatus, Riedel, 2019

Riedel, Matthias, 2019, Four new species of the genus Megalomya UCHIDA (Hymenoptera, Ichneumonidae, Alomyinae) Irom Laos, Linzer biologische Beiträge 51 (1), pp. 179-187 : 180

Megalomya albomaculatus nov.sp. (figs 1, 4, 5, 9)

T y p e m a t e r i a l: Holotype: ♂ ̎ Lao,HuaPhanProv., Phon-Pan,Umg. Ort Ban Saleui , 20°13́30́́N 103°59́26́́E, 1350-1900 m MSL. 10.05.2011, leg. C. Holzschuh & natives̎ ( Linz ).

D e s c r i p t i o n: ♂. Body length 21 mm. Flagellum with 34 flagellomeres, almost filiform; all flagellomeres longer than wide. Temples strongly and linearly narrowed behind eyes, seen from dorsal about 0.6x as long as eyes, smooth and with very scattered fine punctures. Occipital carina complete and slightly lamelliform. Frons strongly impressed centrally, with a large tooth-shaped median extension (fig. 4). Face and clypeus coarsely and densely punctate. Inner eye margins slightly divergent ventrally. Apical margin of clypeus slightly concave. Labrum exposed, with concave apical margin ( fig. 5 ).

Pronotum smooth, with scattered fine setiferous punctures; short epomia present. Notauli strongly impressed in frontal 0.6 of mesoscutum. Mesoscutum smooth and shining, with scattered punctures and some irregular rugae. Subtegular ridges slightly widened frontally, mainly sharp. Mesopleura smooth, with scattered fine punctures. Metapleura with scattered punctures dorsally and some coarse rugae ventrally. Scuto-scutellar groove narrow, arc-shaped. Scutellum flat, longer than wide, punctate, without lateral carina. Area basalis with strong median tubercle. Area externa smooth. Areae superomedia and dentipara with transversal rugae. Area petiolaris with some irregular rugae. Hind femur 4.0x longer than wide.

Areolet pentagonal, 2 nd recurrent vein reaching areolet at its distal 0.7. Nervulus postfurcal by 0.7x its length. Nervellus in hind wing intercepted at apical 0.6.

1 st tergite c.1.4x longer than wide, with median longitudinal impression and coarse rugae. 2 nd tergite about as long as wide, with coarse rugae in basal half and dense punctures in apical half. 3 rd tergite 0.95x as long as wide, densely punctate, with fine rugae in basal fourth.

Color: Black. Ivory are flagellomeres 13-25, palps, mandibles except teeth, labrum, clypeus, face, genae and malar spaces, frontal orbits, propleura, two paramedian longitudinal stripes on mesoscutum (interrupted in the center), tegulae, subtegular ridges, stripe on mesopleura, scutellum and postscutellum. Metasoma black, 1 st tergite apically and 2 nd tergite basally with some reddish-brown suffusion. Fore coxae completely and mid and hind coxae apically, all trochanters and trochantelli ivory. Femora brown, fore and mid femora with ivory frontal stripes. Tibiae and tarsi ivory. Wings moderately infuscate, with stronger infuscation on frontal margin of fore wing; pterostigma black.

♀ unknown.

Remark: This new species is characterized by the concave apical margins of clypeus and labrum, the extended ivory coloration, strong tooth-shaped extension of frons and strongly postfurcal nervulus. In the key of the known Megalomya males ( HE 1991), this new taxon runs to M. longiabdominalis UCHIDA, 1940, but differs by the form of clypeus and labrum, darker metasoma, ivory flagellar ring, ivory stripes on mesoscutum and a different surface structure of the 2 nd tergite.

Figures

Figs 5-8: Face frontally: (5) Megalomya albopunctatus nov.sp. ♂; (6) Megalomya melanogaster nov.sp. ♂; (7) Megalomya rufator nov.sp. ♀; (8) Megalomya nigrolineatus nov.sp. ♀. Figs 9-10: Head dorsally: (9) Megalomya albopunctatus nov.sp. ♂; (10) Megalomya melanogaster nov.sp. ♂.