Palpostilpnus striator ( Aubert, 1961 )

Reshchikov, Alexey, Santos, Bernardo F., Liu, Jing-Xian & Barthélémy, Christophe, 2019, Review of Palpostilpnus Aubert (Hymenoptera, Ichneumonidae, Phygadeuontinae), with the description of ten new species, European Journal of Taxonomy 582, pp. 1-63 : 55-57

Palpostilpnus striator ( Aubert, 1961)

Fig. 28

Townostilpnus (Palpostilpnus) striator Aubert, 1961: 59 .

Diagnosis

Body short and stout. Mesopleuron striated. Propodeal carinae partly present. Ovipositor 1.5 times as long as hind basitarsus. Body mostly black, with middle flagellomeres dorsally, palpi, trochanters, basal part of hind tibia and T6 white. Wings infuscate by two bends.

Material examined

Holotype PHILIPPINES • ♀; Mindoro , Mt Dong; 18 Apr. 1954; J. Aubert and H. Townes leg.; photographs examined; USUC.

Description

Female (holotype)

SIZE. Fore wing length 4.0 mm. Body short and stout, 1.25 times as long as high ( Fig. 28A ).

HEAD. Face 1.45 times as broad as high, centrally slightly convex, finely granulose ( Fig. 28D ). Clypeal suture indistinct. Clypeus slightly convex, matte, transversely striate, apically evenly convex downwards, with sharp apical margin. Mandible basally smooth; teeth sharp, dorsal tooth broad and decurved, much longer than ventral one. Malar space granulated, 0.6 times as long as basal mandible width. Gena glossy, smooth and shiny, with no distinct carina dorsally between vertex and eye. Vertex smooth to coriarious; posterior portion from behind ocelli to occipital carina slanted almost vertically, slightly concave. Frons transversely striate, lower portion slightly concave. Antenna slightly shorter than body, with 21 flagellomeres, median portion strongly thickened.

MESOSOMA. Pronotum rugulose. Epomia indistinct. Mesoscutum wide and short, convex, mostly coriarious, with short transverse striae over notaulus. Notaulus distinct, reaching past half length of mesoscutum. Scutellum convex, with strong, regularly-spaced longitudinal striae. Postscutellum transverse, smooth. Mesopleuron mostly smooth, with three vertical lines of transverse striae extending near epicnemium, speculum and posterior margin, with sparse, small smooth areas, sparsely pilose. Epicnemial carina short, extending through ventral 0.4 of mesopleuron ( Fig. 28C ). Sternaulus distinct, extending over entire mesopleuron. Juxtacoxal carina indistinguishable from other metapleural rugae. Submetapleural carina complete. Fore wing with 1cu-a distinctly distad of M becoming Rs, 3rs-m absent, distal abscissa of M spectral; ramulus absent; length of vein Cu distinctly longer than 2cu-a. Hind wing with cu-a strongly inclivous and interrupted at lower 0.2. Distal abscissa of Cu spectral. Distal abscissa of M spectral. Inner profile of fore basitarsus with basal half distinctly bent. Hind coxa punctate along lateral longitudinal portion, elsewhere smooth. Hind femur stout, with distinct ridge-like swelling on basal 0.3 of posterior face. Basal portion of hind tibia slender, gradually thick toward apex. Longer spur of hind tibia 0.35 times as long as hind basitarsus. Propodeum steeply sloping in lateral view, centrally smooth, anterior and lateral portions rugulose. Propodeal carinae present and distinct.

METASOMA ( Fig. 28A ). T1 approximately 2.5 times as long as apically broad; portion just before posterior apex bulging and distinctly broader than posterior margin; petiole flat, laterally smooth, dorsally with fine, longitudinal striae extending into postpetiole; median dorsal carina absent; dorsolateral and ventrolateral carinae weak to almost indistinct, fading towards posterior apex; spiracle small, round, not prominent. T2 and T3 covered with fine but distinct longitudinal striae. T2 long and widened posteriorly, approximately 1.4 times as long as apically broad. T3 approximately 1.0 times as long as apically broad, parallel-sided. Ovipositor 1.5 times as long as hind basitarsus.

COLOUR. Body almost entirely blackish, with legs mostly brownish to orange. Head black; scape and pedicel ferruginous-brown; flagellum brown, flagellomeres 6–10 dorsally white. Apex of mandible reddish. Palpi whitish. Mesosoma black. Fore leg ferruginous except trochanter whitish; mid and hind coxae brown, trochanters whitish; remainder of mid leg fuscous, except basal 0.6 of dorsal face of tibia whitish. Hind leg apicad of trochanter dark brown, except basal 0.25 of tibia whitish. Fore wing with distinct median and subapical infuscate bands. T4–T7 brownish, T5–T7 with posterior whitish band, S2 whitish.

Remarks

This species is similar to P. papuator ( Aubert, 1961) , from which it can be distinguished by the following combination of characters: frons transversally striated, shiny, as well as mesonotum and mesosternum, ovipositor 1.5 times as long as hind basitarsus (2.1 times in P. papuator ).

Distribution

Philippines (Mindoro).

Figures

Fig. 28. Palpostilpnus striator (Aubert, 1961), holotype, ♀ (USUC). A–B. Lateral habitus. C. Mesopleuron. D. Head, anterior view.