Eustenogaster

Saito, Fuki & Kojima, Jun-Ichi, 2007, A taxonomic revision of the hover wasp genus Eustenogaster van der Vecht (Insecta: Hymenoptera; Vespidae, Stenogastrinae), Zootaxa 1556, pp. 1-30 : 3-6

Genus Eustenogaster van der Vecht

Eustenogaster van der Vecht, in Yoshikawa et al., 1969: 165, as a genus. Type species: Ischnogaster micans de Saussure, 1852, by original designation.

Paravespa Bell, 1936: 803 , 806, fig. 1, as a genus. Type species: Paravespa eva Bell, 1936 [= Stenogaster eximioides Dover and Rao, 1922 ], by subsequent designation of van der Vecht and Carpenter (1990: 44). Junior homonym of Paravespa Radoszkowski, 1886 [ Vespidae , Eumeninae ].

Large wasps in Stenogastrinae ; body length (head + mesosoma + first two metasomal terga) 14–21 mm, forewing length more than 14 mm. Head in frontal view about as wide as high ( Figs. 26 , 41 , 46 , 52, 55 ); eyes enlarged, in lateral view swollen in ventral half (Figs. 6, 36, 42, 47, 51, 53); occipital carina reaching and fused with hypostomal carina; mandible oblong-shaped (Figs. 5, 13, 22, 25, 27, 34). Scutum with notauli present at most as traces, usually obscured by punctation; scutellum strongly convex (Figs. 37, 49), with more or less prominent, median, longitudinal carina; propodeum with very shallow, sparse punctures or smooth-surfaced; propodeal valvula large, rounded (Fig. 1). Second metasomal segment non-petiolate basally ( Fig. 30 ).

Color. Body dark brown to black, with some bright-colored markings.

FIGURES 1–8. 1, Eustenogaster fraterna . 2–5, E. agilis . 6–8, E. fulvipennis .1–4, female. 5–8, male. 1, propodeal valvula (PV), hind coxa (HC) and first metasomal tergum (MTI). 2, ocelli. 3, second metasomal tergum in profile. 4, sixth metasomal tergum in lateral view. 5, mandible. 6, head in lateral view. 7, apical part of clypeus. 8, lateral furrows on pronotum in lateral view. Scale bars show 1 mm.

FIGURES 9–16. 9–14, Eustenogaster fraterna . 15–16, E. nigra . 9–12, female. 13–16, male. 9, ocelli. 10 and 15, first metasomal segment in dorsal view. 12, sixth metasomal tergum in lateral view. 13, mandible. 11 and 14, second metasomal tergum in profile. 16, minute serration of lateral margin of pennies valve. Scale bars show 1 mm except for fig. 16.

Female. Clypeus more or less pointed apically (Figs. 21, 26, 32, 35, 41, 52); anterior ocellus somewhat elliptical, wider than long; posterior ocellus more or less circular (Figs. 2, 9, 29, 43, 54); mandible with three teeth (Figs. 22, 27, 34). Sixth (=terminal) metasomal tergum with tubercle or spine (Figs. 4, 12, 28, 50).

Male. Antenna with terminal flagellomere conical. Length of second maxillary palpomere longer than that of third to sixth palpomeres combined. Metasomal terga with tubercle or spine absent. Genitalia: Parameral spines tapering apically ( Fig. 59 A); aedeagus slender, in lateral view slightly dilated apically ( Fig. 59 B–M), laterobasally with a pair of projections; volsella longer than wide, bent at anterior margin, with beak-shaped digitus ( Fig. 59 N–Y).

Figures

FIGURE 59. Male genitalia in Eustenogaster species. (A) E. gibbosa, in ventral view. (B – M) aedeagus in lateral view; (N – Y) vollsela with digitus in lateral view; (B, N) E. agilis; (C, O) E. fulvipennis; (D, P) E. fraterna; (E, Q) E. scitula; (F, R) E. calyptodoma; (G, S) E. gibbosa; (H, T) E. hauxwellii; (I, U) E. micans; (J, V) E. latebricola Saito, sp. nov.; (K, W) E. palavanica; (L, X) E. luzonensis; (M, Y) E. spinicauda Saito, sp. nov..

FIGURES 26 – 31. Eustenogaster fumipennis Saito sp. nov., holotype female; 26, head in frontal view. 27, mandible. 28, flat area of sixth metasomal tergum. 29, ocelli. 30, second metasomal tergum in dorsal view. 31, propodeum in dorsal view. Scale bars show 1 mm.

FIGURES 39 – 45. Eustenogaster latebricola Saito, sp. nov.; 39, 41 – 45, holotype female. 40, paratype male. 39 – 40, second metasomal tergum in profile. 41 – 42, head; 41, frontal view and 42, lateral view. 43, ocelli. 44, lateral and dorsolateral furrows of pronotum. 45, first metasomal segment. Scale bars show 1 mm.

FIGURES 46 – 49. 46 – 48, Eustenogaster latebricola Saito, sp. nov., male paratype. 49, E. eximia, female. 46 – 47, head; 46, frontal view and 47, lateral view. 48, ventroapical part of penis valve of aedeagus. 49, scutellum (SCL) and metanotum (MN) in lateral view. Scale bars show 1 mm except for fig. 48.

FIGURES 50 – 56. Eustenogaster spinicauda Saito, sp. nov.; 50, 52 – 54. 56, female holotype. 55 and 51, male paratype. 50, sixth metasomal tergum in lateral view. 51 – 53. 55, head; 52 and 55, frontal view, 51 and 53, lateral view. 54, ocelli. 56, second metasomal tergum in lateral view. Scale bars show 1 mm.