Eustenogaster spinicauda Saito

Eustenogaster spinicauda Saito , sp. nov.

This species is similar to E. calyptodoma , but can be distinguished from the latter by the following characters: larger body size (see below); female clypeus and supraclypeal area with sparse and shallow punctures, impunctate supraclypeal area larger than in E. calyptodoma , and space between antennal sockets irregularly punctate; punctures on mesoscutum sparser, some interspaces in anterior part larger than puncture; female sixth metasomal tergum with stout spine ( Fig. 50 View FIGURES 50 – 56 ); dorsal half of male clypeus more or less convex ( Fig. 51 View FIGURES 50 – 56 ), ventral half of clypeus slightly concave; digitus apically with long hairs ( Fig. 59 View FIGURE 59 Y); aedeagus more elongate than in E. calyptodoma ( Fig. 59 View FIGURE 59 M); gena and eye emargination entirely black.

Female. Body length (head + mesosoma + first two metasomal segments) 18.5–21 mm ( holotype: about 21 mm); forewing length 14.5–16 mm ( holotype: about 15 mm).

Head in frontal view about as wide as high ( Fig. 52 View FIGURES 50 – 56 ). Eyes in lateral view ( Fig. 53 View FIGURES 50 – 56 ) with maximum width about 4.1 times as wide as that of gena. Anterior ocellus about 1.3 times larger in width than posterior ocellus ( Fig. 54 View FIGURES 50 – 56 ); distance between anterior and posterior ocelli shorter than diameter of posterior ocellus; posterior ocelli separated from each other by distance about equal to or slightly larger than their diameter.

First metasomal tergum narrow and long ( 7.2–8.2 mm long), about 5.7 times longer than its maximum height, about 5.8 times longer than the maximum width.

Color: Body black; marking pattern and wing coloration similar to that of E. calyptodoma , but differing in spot in eye emargination absent ( Fig. 58 View FIGURE 58 ) and in basal part of second metasomal tergum colored pale-brown or orange instead of yellow.

Male. Body length (head + mesosoma + first two terga) 16–18.5 mm; forewing length 14–15.5 mm. Head in frontal view about as wide as high ( Fig. 55 View FIGURES 50 – 56 ); eye enlarged, in lateral view strongly swollen ( Fig. 51 View FIGURES 50 – 56 ), with maximum width slightly more than five times as wide as that of gena; clypeus entirely yellow or with only small, black spot; eye emargination sometimes with small yellow spot; mandible sometimes with yellow spot at base; propodeum with dorsolateral yellow marking, sometimes split into two spots.

Type material: Holotype female (deposited in RMNH) labeled “Catbalogan, Samar, Eustenogaster spinicauda , Ψ, m. det. J.v.d.Vecht, 1960” and “ Paratype ”.

Paratypes: Philippines: 1ɗ ( RMNH), Catbalogan, Samar; 1Ψ ( RMNH), Surigao, Mindanao, JvdV; 4ɗ ( GMNH), Borongan, E. Samar, 7–18.v.1984, CKS; 2Ψ42ɗ ( GMNH), Leyte, Baybay, CKS [2Ψ30ɗ, 28.viii.1980; 3ɗ, 27–29.viii.1980; 2ɗ, 5.ix.1984; 4ɗ, 29.iv.1987; 3ɗ, 6.v.1987]; 2Ψ ( GMNH), Mindanao, Bukidonon, Musuan, Maramag, 3.i.1985, CKS & L. Pinto.

Distribution: Philippines: Mindanao, Leyte, Samar.

Etymology: The specific name spinicauda is based on van der Vecht’s manuscript name. This is a compound of a feminine Latin noun, spini (= thorn-bush), and a feminine Latin noun, cauda (= tail), referring to the stout spine of the female sixth metasomal tergum.