Spilomena socialis Matthews, 2014

Turillazzi, Stefano, Matthews, Robert W., Pradella, Duccio, Meucci, Fabio & Baracchi, David, 2014, Nest architecture and colony composition of communally nesting Spilomena socialis sp. n. (Hymenoptera, Crabronidae, Pemphredoninae) from peninsular Malaysia, Journal of Hymenoptera Research 41, pp. 113-129 : 114-116

Spilomena socialis Matthews sp. n.

Figs 1 , 2 , 3 , 4 , 5

Holotype.

Female, 03°42.77'N, 101°46.32'E MALAYSIA: Pahang State, Bukit Fraser, Feb. 2007, 1600 m, S. Turillazzi (The Natural History Museum, London, UK [BMNH]).

Paratypes: 3 females, 3 males, same data as holotype (in The Natural History Museum (BMNH), one male, U.S. National Museum, Washington, DC (USNM), one male, one female, Australian National Insect Collection, Canberra, Australia (ANIC), one male, one female, University of Georgia, Athens, Fattig Museum), one female.

Female.

Body length, 4 mm.

Head. (Figs 2 - 3 ). Transverse, globular, eyes slightly convergent dorsally; Vertex finely, distinctly coriareous; setigerous punctures minute; single elongate seta just in front of each lateral ocellus; occipital carina lacking; frontal carina extending about 1/2 distance to median ocellus; gena longitudinally finely striate ventrally, becoming smooth dorsally; clypeus broadly emarginate, faintly striate near orbits; malar space distinctly less than diameter of median ocellus (9:16); labrum deeply notched medially; frons distinctly protuberant, evenly convex; antennal sockets separated from clypeal margin by about their diameter, and from eyes by twice their diameter; mandibles bidentate, outer tooth distinctly longer than inner tooth. Antenna. Scape about 6 times longer than maximum width, about equal in length to pedicel plus the first 5 flagellomeres; pedicel, first and second flagellomeres subequal in length; last flagellomere elongate, about twice as long as penultimate flagellomere.

Mesosoma. (Figs 1 and 2 ). Pronotal carina well defined, straight. Notauli distinct, punctate-crenulate, reaching nearly to center of scutum; scutum, scutellum, metanotum, and mesopleuron predominantly coriareous with minute setigerous punctures; scutum with narrow crenulate furrow along lateral margin above wing insertion; scutellum anteriorly with a broad transverse crenulate furrow; episternal sulcus incomplete, weakly aerolate; Posterior-lateral corners of propodeal hind face each with a small but distinct tooth-like turbercle; propodeal dorsum areolate with a network of coarse ridges.

Gaster. Tergum I basally longitudinally striate, apically smooth and shining; tergites II-VII shining, faintly scaly reticulate and sparsely clothed with short, erect setae; dense brush of short setae at apex of Tergite VI.

Forewing. (Fig. 4 ). Marginal cell distally acute; two submarginal cells; lm-cu vein proximal to bifurcation of Rs + M. M absent beyond lr-m. Stigma L:W = 8:3; hind wing with cu-a straight, not appendiculate.

Color. (Figs 1 - 3 ). Body predominantly black, non-metallic, gaster dark brown. Antennae, palps, mandibles, tegula, and legs (including coxae) uniformly yellow; apical margins of clypeus and pronotum yellow; wing veins yellow, becoming brown distally beyond stigma; mandible tips and stigma brown; pronotal lobes with cream spot on posterior portion. Setal brush on tergite VII white.

Male.

Similar to female, except body color uniformly dark brown and clypeus and frons with extensive cream colored maculations (Fig. 5 ); mandibles cream colored, tips light brown; antennae, palps, pronotal lobes, legs and wing veins colored as in female.

Remarks.

The presence of two submarginal cells, the entirely yellow clypeal margin, and the pair of elongate ocellar setae readily distinguish this species from S. obliterata Turner (1914), the only other Spilomena species described from Malaysia.

Figures

Figure 1. Spilomena socialis sp. n., holotype female, lateral habitus.

Figure 2. Spilomena socialis sp. n., holotype female, head and mesonotum dorsal view.

Figure 3. Spilomena socialis sp. n., holotype female, head frontal view.

Figure 4. Spilomena socialis sp. n., holotype female, fore and hind wing.

Figure 5. Spilomena socialis sp. n., male head, frontal view.