Liostenogaster bimaculata Selis, 2018

Selis, Marco, 2018, Notes on the subfamily Stenogastrinae (Hymenoptera: Vespidae) in the Philippine Islands, with description of nine new species, Zootaxa 4514 (3), pp. 383-410 : 387-389

Liostenogaster bimaculata Selis , sp. nov.

( Figs. 6–14 )

Diagnosis. Liostenogaster bimaculata differs from the other species of the genus by the absence of teeth on the tarsal claws, the crenulate anterior margin of female clypeus, and the elongate male antennae.

Material examined. HOLOTYPE, ♀ labeled: “Philippines, Mindanao, Agusan, Esperanza / III.2014 / Leg. local collector // Liostenogaster bimaculata / Selis, sp. nov. / HOLOTYPUS ♀ / Det. Marco Selis 2014” ( MSNVE) . PARATYPES: PHILIPPINES: MINDANAO: Agusan, Prosperidad, III.2016, 1 ♀ ( MSVI) ; Compostela, Masara, VI.2014, 1 ♀ ( MSNVE) ; Compostela Masara , I.2015, 1 ♀ ( MSVI) ; Compostela Masara , II.2015, 1 ♀ ( MSNVE) ; Davao, Governor Generoso, XI.2017, 2 ♀ ( MSVI) ; Davao, Governor Generoso, II.2018, 1 ♀ ( MSVI) ; Davao Oriental, Governor Generoso, XII.2017, 1 ♂ ( MSVI) ; Davao Oriental, Governor Generoso, I.2018, 1 ♀ ( MSVI) ; Kiamba , Sarangani, XI.2017, 2 ♀ ( MSNVE) ; Surigao , Tandag, Sigaboy, I.2018, 1 ♂ ( MSNVE) ; SAMAR: Lope de Vega , XII.2016, 1 ♀ ( MSVI) .

Description. Female. Body length 11.7–13.5 mm (holotype 12.4 mm); fore wing length 10.5–11.7 mm (holotype 10.6 mm).

Head as long as wide in frontal view ( Fig. 8 ). Clypeus elongate ventrally, 1.4× as long as wide, apically with a long bifid tooth, anterior margin crenulate, weakly concave apically in lateral view. With weakly-developed and broadly interrupted carina from interantennal area to anterior ocellus. Distance between ocelli shorter than ocellar diameter. Mandible tridentate, median tooth apically truncate. Antennal scape 2.9× as long as its apical width, F1 3.6× as long as its apical width, F2–F9 longer than wide, F10 bullet shaped, 1.4× as long as its basal width ( Fig. 9 ).

Mesoscutum as long as width between tegulae and strongly convex in lateral view, notaulices present as very narrow furrows, parapsidal sulci clearly marked. Scutellum strongly convex. Metanotum weakly convex, almost entirely vertical. Propodeum convex in lateral view, longitudinal median furrow complete from anterior to posterior margin ( Fig. 10 ).

T1 5.8× as long as maximum width, in lateral view shallowly concave in front of apical bulge. T 2 in profile almost linear from base to apex, only weakly convex apically.

Claws of all legs simple, without tooth on inner margin ( Fig. 11 ).

Clypeus smooth with some sparse fine punctures. Frons with dense shallow punctures. Mandibles with scattered deep punctures. Mesosoma entirely smooth and shiny, except for striae on ventral corners of pronotum. Metasoma smooth but less shiny than mesosoma.

Color. Head reddish-brown, mesosoma and T1 dark brown, T2–T6 lighter than mesosoma and T1; following parts yellow: long lateral stripes on clypeus, squared lateral spots on supraclypeal area, two little spots above antennal sockets, ocular sinus, broad band behind eye, broad line on posterodorsal margin of pronotum, anterior margin of pronotal collar, large spots on anterior corners of scutellum, metanotum except posterior margin, propodeum except basal half of posterior face, triangular spot below wing on mesepisternum, lunate mark below transverse furrow, dorsal spot on metaepisternum, two rounded lateral spots on T2, median band on disc of T4–T5, lateral stripes on apex of S1, longitudinal stripes on S2, fore legs, apical half of middle femora, fore and middle coxae entirely, dorsal face of posterior coxa.

Male. Body length 12.1–12.3 mm; fore wing length 10.6–10.7 mm.

Like female, except: head 1.25× as wide as long in frontal view ( Fig. 13 ); clypeus shorter and weakly pointed apically, 1.2× as long as wide, separated from frons by shallow depression; mandibles tridentate, inner tooth small and apically pointed, median tooth triangular with rounded apex, apical tooth long and pointed, weakly curved; eyes larger, inferior lobe more developed than in female; antenna more elongate, weakly enlarging towards apex, scape 3× as long as apically wide, F1 3.9× as long as wide, F2–F10 longer than wide, F11 1.5× as long as basally wide ( Fig. 14 ); metanotum distinctly convex anteriorly; T1 6.3× as long as maximum width; S7 apically rounded, medially depressed; frons and mandibles nearly impunctate; face densely covered by silvery pubescence.

Color. Black, tending to dark brown on metasoma and pronotum; following parts yellow: whole face below antennal toruli, ocular sinus, spot above antennal torulus, mandibles except base and margins, pronotal collar, posterodorsal margin of pronotum, anterolateral transverse spots on scutellum, anterior half of metanotum, transverse band on ventral third of posterior face of propodeum continuing on lateral faces, oval spot below base of wing on mesepisternum, transverse spot below transverse furrow, posterodorsal spot on dorsal plate of metaepsiternum, lateral spots on T2 and S2, anterior face of fore coxa, lateral spots on mid and hind coxae; legs brownish-ferruginous.

Distribution. Philippine Islands: Mindanao, Samar.

Etymology. The specific name refers to the spots on T2.

Figures

FIGURES 6–11. Liostenogaster bimaculata Selis, sp. nov., ♀. 6, Habitus in dorsal view. 7, Habitus in lateral view. 8, Head in frontal view. 9, Antenna in lateral view. 10, Propodeum in posterodorsal view. 11, Apical tarsomere in lateral view.

FIGURES 12–14. Liostenogaster bimaculata Selis, sp. nov., ♂. 12, Habitus in lateral view. 13, Head in frontal view. 14, Antenna in lateral view.