Eustenogaster gibbosa Starr

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 : 22-23

Eustenogaster gibbosa Starr & van der Vecht, 2006

Eustenogaster gibbosa Starr and van der Vecht, in Hashim et al. 2006: 291.

Eustenogaster gibbosa can be easily distinguished from any other known species of the genus by the presence of a prominent transverse impression of the second tergum that separates the strongly swollen posterior twofifths from the anterior weakly swollen part of the tergum (Fig. 33). Aside from the such impression, this species has features similar to that of E. calyptodoma , but can be distinguished from the latter by the combination of the following characters: female clypeus finely and sparsely punctate, with extreme apex pointed (Fig. 32); female supraclypeal area with median impunctate area much larger than anterior ocellus; male clypeus with hairs sparser than in E. calyptodoma ; aedeagus medially with lateral projection ( Fig. 59 G), with slightly larger serration at proximal margin of penis valve. The gena is entirely black, and yellow markings on the female clypeus and supraclypeal area are smaller ( Fig. 57 ) than in E. calyptodoma .

Female. Body length (head + mesosoma + first two terga) 18–20 mm; forewing length 13.5–15 mm.

Male. Body length (head + mesosoma + first two terga) 17–18 mm; forewing length 13.5–14.5 mm.

The specimens from the Mentawai Islands are much darker colored as follows (see also Hashim et al. 2006).

Coloration of specimens from the Mentawai Islands: Features given in square brackets are for the specimens from other localities. Body shiny black, with yellow markings as follows: paired lateral spots and apical spot on clypeus (sometimes absent), spot below antennal socket [clypeus and supraclypeal area yellow, only with median dark line], small spot at posterodorsal corner of pronotum [broad band, interrupted medially], paired lateral spots on metanotum (sometimes absent) [anterior band], small posterodorsal spots on propodeum (usually absent) [dorsolateral longitudinal bands], paired lateral spots on second tergum [anterior band, sometimes interrupted medially and paired lateral spots on second tergum] and on second and third sterna, paired anterior bands on third tergum [paired anterolateral bands or spots on third to fifth terga]. Legs dark brown; fore tibia sometimes with yellow spot on outer side [following parts yellow: fore leg: lateral side of femur, tibia and tarsus; mid leg: lateral side of tibia and basal half of first tarsomere, small spot on coxa; hind leg: small spots at base and apex of tibia, basal small spot at base of first tarsomere, paired spots on coxa]. Wings semihyaline, brown, and darker along anterior margin of forewing; veins dark brown.

Material examined. Malaysia: Peninsular Malaysia: 1Ψ ( RMNH), Perlis, Bukit Bintang, For. Res. (Kangar), 23.ii.1963, MAL; Borneo; 1Ψ ( IUNH), South East Sabah, nr Danum Valley Field C., c. 150m, Mal. trap 5, 19.iii – 19.vi.1988, CvA & T. Burghouts. Indonesia: Mentawai Is.: 1Ψ ( MNN), Siberut Island, ix.1924, B. Kloss & N. Smedley; 4Ψ ( SKYC), Mentawai Is., Palu Sipora, nr. Baribanua Pasir, 1.viii.1985, SkY & SôY; Bangka Is.: 1Ψ ( RMNH), 450m, Mt. Menoembing, 11.xi.1939, JvdV; Riouw-Archpelago: 1ɗ ( MZB), Doerian, xi.1923, Dammerman; Java: West Java: 1Ψ ( RMNH), 6–800m, Djampang Tengah, G. [= Mt.] Tjisoeroe, iii.1933, MEW, misit; 1Ψ ( MZB), Palaboean Ratoe, xii.1936, Tjisolok & F Dupont; 2Ψ4ɗ, 100m, Dungus Iwul, [1Ψ ( RMNH), 4.xi.1952, AMRW; 1Ψ ( RMNH), 14.xii.1952, MAL; 2ɗ ( RMNH), 2.xii.1952, MAL; 1ɗ ( MZB), 2.xii.1952, Leg. manis; 1ɗ ( MZB), 30.ix.1964, MaehFiidz]; Kalimantan: East Kalimantan: 1Ψ ( MZB), 125m, TaBang, Bengen River, 11.x.1956, AMRW; 2Ψ1ɗ ( MZB), 01°02’S, 117°02’E, 38km, Wanarise Res. St. 60m, Kutai, Samboja, N. Balikpapan, malaise trap, DCD, RU & Sutrisno, [1Ψ, vi.1992, IIS 920204; 1Ψ, 1983, vi.1992, IIS 920200; 1ɗ, 1983, iv.1992, IIS 920154]; 1Ψ ( MZB), 02°52’S, 115°49’E, Pujungan, Kayan-Mentarang, Reg. L Alango, along Bahau R., rice paddy–sawah, malaise trap, iv.1993, DCD & RU; 1Ψ3ɗ ( NIAES), Bukit Soeharto, 13–17.iii.1994, KM & KK; West Kalimantan: 1Ψ ( MZB), 01°25’S – 01°50’S, 108°40’– 109°10’E, 350m, Karimata Island Nat., Ketapang Res, General Collections, Closed canopy, ii.1991, IIS 910040, per Sutrisno Djenal.

Locality unknown: 2Ψ ( RMNH), Museum Leiden, iv.1935, MEW.

Distribution: Malaysia: Peninsular Malaysia, Borneo; Singapore; Indonesia: Kalimantan, Sumatra, Mentawai Is., Kurakatau, Java, Bangka Is.

Figures

FIGURE 57. Facial marking pattern of Eustenogaster species.

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..