Eustenogaster micans

Eustenogaster micans (de Saussure, 1852)

Ischnogaster micans de Saussure, 1852: 24.

? Ischnogaster ornatifrons Cameron, 1902: 105.

Based on Carpenter and Kojima (1997: 26) and van der Vecht’s unpublished note, we treat Ischnogaster ornatifrons Cameron, 1902, as a probable synonym of E. micans, which, however, should be confirmed in a future study. Eustenogaster micans is a species that is similar to E. calyptodoma, but can be easily distinguished from the latter by the following characters: female scutellum strongly convex (Fig. 37), with median carina; female sixth metasomal tergum with sharp spine; male digitus ventrally projected and with small spine (Fig. 59 U), ventroproximal margins of pennis valves with large serration (Fig. 38). As pointed out by Sakagami and Yoshikawa (1968) and Yoshikawa et al. (1969) the nest architecture is distinctly different between E. micans and E. calyptodoma. That is, in E. micans the envelope is made by extension of outer walls of the peripheral cells while the nest envelope of E. calyptodoma is independent of the comb. The envelop of an E. micans nest has fin-like extensions on the outer surface (Yoshikawa et al. 1969, plate 28; Ohgushi et al. 1983, cited as Eustenogaster sp. [E1]), which are absent in E. calyptodoma (Yoshikawa et al. 1969; Ohgushi et al. 1990).

The occurrence of E. micans in Yunnan, China (recorded by Dong & Otsuka 1997) needs confirmation.

Material examined. Thailand: 1Ψ (IUNH / FSHU), Sungai Ladung, 4.xi.1980, KCN depign; 1Ψ (SKYC), Maeklong Watershed, Research Station, Kanchanaburi Prov., 29.xi.2003, SkY [small yellow spot on gena]. Malaysia: Peninsular Malaysia: 2Ψ (IUNH / FSHU), Frasers Hill, Selangor, [1Ψ, FH 10–1–1; 1Ψ, FH 10-1-2]; 1ɗ (RMNH) Kuala Seleh, Selangor, 6.vii.1947, HTP; 21ɗ (RMNH), Surgei Jaham, Pahang, FMS, 22.xi.1922; Borneo: 1Ψ1ɗ (SKYC), Sarawak, SkY [1ɗ, Kubah NP, 5.xii.1993; 1Ψ, Bako NP, 21–22.iv.1993]. Singapore: 1ɗ (RMNH), Coll. Barker. Indonesia: Sumatra: South Sumatra: 1ɗ (RMNH), Gn. [= Mt.] Betoeno, 400m, S. Oenoeilangta Est, 27.iii.1937, JvdV; Lampung: 2ɗ, Mt. Tanggamoes, Giesting, S.W. Lampungs, 27.vi.1933, [1ɗ (RMNH), 500m, Toxopeus; 1ɗ (MZB), 600m, MAL & Toxopeus]; West Sumatra: 3ɗ (RMNH), Anei Kloof, 500m, 1926, EJ; 2ɗ (IUNH / FSHU), Teluk Kabung, 8.x.1980; 1Ψ (SKYC), Ait Maneut, 21.xii.1980, SôY; Bangka Is.: 1Ψ (RMNH), Tjeloeak, 13.iii.1935, JvdV; 1ɗ (RMNH), Mt. Matas, 600m, Banka, 15.vi.1930, JvdV; Java: 1Ψ (RMNH; lectotype of Stenogaster micans by designation of Kojima & van Achterberg [1997: 163]); West Java: 2Ψ2ɗ (MZB), Mt. Gede, i.1935, native collected; 1Ψ (RMNH), iii.1935, Wynkoopsbaai, Mrs. M. Walsh; 1Ψ1ɗ (RMNH), Djampang Tengah, iv.1935, MEW; 1Ψ (RMNH), Preanger, 335m, Redjamandala, vi.1935; 1Ψ (RMNH), 800m, Mt. Gedeh Tapos, 1–16.viii.1936, JvdV; 1Ψ (RMNH), 500m, G. [= Mt.] Pantjar, i.1937, F. Dupont; 1Ψ (MZB), 100–250m, Buitenzorg, Djanuiga, 18.vii.1937, MAL; 1ɗ (RMNH), 5–600m, G. [= Mt.] Gocha, Djampang Koclon, xii.1939, MEW; 1Ψ (MZB), 100m, Dungus Iwul, 9.i.1953, AMRW; 2Ψ (RMNH), 0–50m, Pelambuan Ratu, 5–6.viii.1972, JvdV; Central Java: 2ɗ (RMNH), Noesa Kambangan, iii.1911, EJ; East Java: 1ɗ (RMNH), Marang, Coll. Gribodo; Kalimantan: East Kalimantan: 1Ψ (MZB), 125m, Tabang, 24.x.1956, Bengen River, AMRW; 1Ψ3ɗ (MZB), 02°52’N, 115°49’E, Pujungan, Kayan Mertarang Nature Reserve, WWF station, Malayse trap, DCD & RU [1Ψ, Lalut Paro, 310m, v.1993; 3ɗ, Lalut Birai, Puncak, 650m, (1ɗ, viii.1993; 1ɗ, x.1993; 1ɗ, v.1993)]; 3ɗ (MZB), 01°02’S, 117°20’E, 60m, Wanariset Research Station, Kutai, 38km, N Balikpapan, Samboja, Malayse trap, iv.1992, DCD, RU & Sutrisno; 1ɗ (NIAES), Bukit Soeharto, 13–17.iii.1994, KM & KK; 1ɗ (MZB), Kersik Kerbangan, Kee. Melak, 8.i.1982, Ouchar.

Locality Unknown: 1ɗ (RMNH), Cat. No. 9, Museum Leiden; 1ɗ (RMNH), Mus. Zool. Bogoriense, “ I. ornatifrons ” det. MAL, Beske ex. Vam.

Distribution: China: Yunnan (?); Myanmar; Thailand; Malaysia: Peninsular Malaysia, Sarawak; Singapore; Indonesia: Kalimantan, Sumatra, Bangka Is., Java.