Eustenogaster hauxwellii ( Bingham, 1894 )

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 : 23-24

Eustenogaster hauxwellii ( Bingham, 1894)

Ischnogaster hauxwellii Bingham, 1894: 386 , pl. 1 fig. 4.? Stenogaster bicarinata Dover and Rao, 1922: 242 .

In the genus Eustenogaster , E. hauxwellii is known to have the widest distribution, occurring from India in the west to Java and Bali in the east. This species is superficially very similar to E. calyptodoma , especially in the facial marking pattern ( Figs. 58 , 57 for E. calyptodoma ), but E. hauxwellii is different from E. calyptodoma in the following structural characters: in the female, space between antennal sockets with well-defined punctures, which are more clearly separated from each other than in E. calyptodoma , mandibular mid-tooth bluntly projected (Fig. 34) [emarginate apically in E. calyptodoma ; Fig. 22], sixth metasomal tergum with tubercle blunt [usually prominent in E. calyptodoma ]; in male, dorsal half of clypeus flattened [slightly convex in E. calyptodoma ], space between antennal sockets with punctures larger than in E. calyptodoma , seventh metasomal tergum entirely covered with long hairs, digitus with long hairs ( Fig. 59 T), volsella with spine absent, aedeagus apically less swollen ( Fig. 59 H) than in E. calyptodoma ( Fig. 59 F). The marking pattern is similar to that of E. calyptodoma in both females and males but different as follows; the spots on the pronotal collar, dorsal spot on the metapleuron and dorsolateral spots on the first metasomal tergum, all yellow, present in E. hauxwellii [absent in E. calyptodoma ]; markings on gena reduced or lacking [developed in E. calyptodoma ].

Body length (head + mesosoma + first two terga) 14–16.5 mm in female, 14–15 mm in male; forewing length 10–12.5 mm in female, 11.5–12.5 mm in male.

Material examined. Cambodia: 5Ψ, Bokor, 30.x.1966 [3Ψ ( IUNH / FSHU), (1Ψ, Bokor–3; 1Ψ, Bokor–5; 1Ψ, Bokor–6); 1Ψ ( SKYC), Bokor–4]. Thailand: 1Ψ ( IUNH / FSHU), Chantaburi, 20.vi.1961, Yoshikawa; 1Ψ ( RMNH), Songkla Province, 9.ix.1975, MH. Malaysia: Peninsular Malaysia: 1Ψ7ɗ ( RMNH), Mt. Kluang, 500m, Johore, 5km E. of Lembak, 29.vii.1972, JvdV; Borneo: Sabah: 1Ψ ( GMNH), Ulu Dusun, 1977, MH; 1Ψ ( GMNH), near Penangpang, 11.v.1985, CKS; 1Ψ ( SKYC), Danum Valley, 30.iv.2000, C. Brühl; Sarawak: 1ɗ ( SKYC), Kubah NP., 5.xii.1993, SkY; 1Ψ ( SKYC), Miri Lambir, Canopy Biology prog., Malaise Trap, 19– 22.X.1992, A0095. Indonesia: Sumatra: 2ɗ ( MZB), Way Kambas, Lampung, 7.ii.1972, Duelaer; Bangka Is.: 1Ψ ( RMNH), Tjeluak, 13.iii.1935, JvdV; 1ɗ ( RMNH), Tru (or Jru), 18.xii.1949, JvdV; Legundi Is.: 1Ψ1ɗ ( RMNH), South Sumatra, 20.vi.1956, AMRW; Sebuku Is.: 2ɗ (1ɗ, RMNH; 1ɗ, MZB), 17.vi.1955, AMRW; Rakata Is.: 9ɗ, AMRW [7ɗ (4ɗ, RMNH; 3ɗ, MZB), 22.vi.1955; 2ɗ ( RMNH), 23.vi.1955]; 2Ψ1ɗ (1Ψ1ɗ MZB; 1Ψ RMNH), ZO, Dammerman, [1Ψ, x.1933; 1Ψ1ɗ, xii.1933]; 7ɗ ( MZB), 16.vii.1982, SkY; Rakata Kecil Is.: 2Ψ3ɗ ( MZB), SkY, [1ɗ, 16.vii.1982; 1Ψ2ɗ, 27.vii.1982; 1Ψ, 28.vii.1982]; 5ɗ ( MZB), J. Yukawa [4ɗ, 9.xi.1982; 1ɗ, 10.xi.1982]; Java: West Java: 2ɗ ( RMNH), 3–35 (iii.1935?), Wijnkoop Bay, MEW; 1Ψ ( MZB), 100–250m, Djasinga, 11.x.1938, MAL; 2ɗ ( MZB), Tdjag Along, Wdjung Kulon, AMRW [1ɗ, 8.vii.1955; 1ɗ, 18.vii.1955]; 1ɗ ( IUNH), 06°42’S, 105°38’E, Sumur, Ujung Kulong, 24.iii.2005, JK; Bali: 1Ψ ( SKYC), West Bali, 1998, IKT, Ginarsa; Kalimantan: East Kalimantan: 1Ψ ( MZB), 50m, Balikpapan, Wain River, xi.1950, AMRW; 1Ψ ( MZB), 125m, Tabang, Bengen River, 21.x.1956, AMRW; 1Ψ2ɗ ( MZB), 95m, Gunungsari, AMRW [1Ψ, 20.viii.1956; 2ɗ, 14.viii.1956]; 1Ψ ( MZB), 02°52’N, 115°49’E, 355m, Pujungan, Kayan Mertarang Nat. Res., WWF station, Lalut Birai, Basa camp, Kubun, x.1993, DCD & RU; 1Ψ ( MZB), 00°42’S, 117°00’E, 60m, Bukit Soeharto Expt. For, 60km S. Samarinda, x.1993, x.1993, DCD & RU; 2Ψ1ɗ ( NIAES), Bukit Soeharto, 13–17.iii.1994, KM & KK [1ɗ, a small yellow mark at just blow anterior ocelli].

Distribution: India: Sikkim; Myanmar; Thailand; Cambodia; Malaysia: Peninsular Malaysia, Sarawak; Singapore; Indonesia: Kalimantan; Sumatra, Bangka Is., Kurakatau Is., Java, Bali (new record), Philippines: Mindanao.

Figures

FIGURE 57. Facial marking pattern of Eustenogaster species.

FIGURE 58. 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..