Delta eremnum

Nugroho, Hari, Kojima, Jun-Ichi & Ubaidillah, Rosichon, 2013, Review of potter wasps with a petiolate metasoma excluding so-called " Zethinae " (Hymenoptera: Vespidae: Eumeninae) in the Lesser Sunda Islands of the Indonesian Archipelago, Zootaxa 3608 (1), pp. 1-25 : 14

Delta eremnum (van der Vecht 1959)

(Figs 32, 35, 38, 41)

Eumenes eremnus van der Vecht 1959: 51, Ƥ, holotype "Labuan Badjo, Flores ", [Nationaal Naturhistorisch Museum - Naturalis, Leiden].

Material examined. SUMBA I.: 1 Ƥ (MZB, paratype of E. eremnum ), alt. 100 m, Laora, N.W Soemba (=Sumba), Dammerman, Apr.1925; 1 Ƥ (MZB, paratype of E. eremnum ), Mau Marru, E. Sumba, Bühler & Sutter, 22 Jul.1949; 1 Ƥ (MZB, paratype of E. eremnum ), Mao Marroe (=Mau Marru), 450 m, Dammerman, May 1925; 1 Ƥ (MZB), 10°01.197'S 120°03.385'E, alt. 320 m, Laiwanggi, A. Perrard, 15–19 Jun.2010; 1 Ƥ (MZB), Laiwanggi, alt. 567 m, A. Perrard, 16 Jun.2010; 1 3 (MZB), 10°01.061'S 120°04.163'E, alt. 567 m, Laiwanggi, A. Perrard, 16 Jun.2010. FLORES I.: 1 Ƥ (MZB, paratype of E. eremnum ), Labuan Badjo, JK de Jong, Jun.1937.

Remarks. This species is very similar to D. sciarum and they may have sometimes been confused with each other. Next characters distinguish D. eremnum from D. sciarum [states for D. sciarum are given in the brackets]: lateral faces of propodeum barely punctured [propodeum entirely with superficial punctures]; posterior face of propodeum with paired narrow longitudinal pale-yellow bands [without such yellow bands]; apical part of volsella of male genitalia short and thick (see van der Vecht 1959: fig. 3f) [long and slender (van der Vecht 1959: fig. 2c)]. Further the following characters may help distinguishing D. eremnum from D. sciarum : female clypeus in frontal view (Fig. 32) slightly higher than wide, 1.1 × as high as wide [proportionally wider, as wide as high (Fig. 33)]; male clypeus 1.1 × as high as wide (Fig. 35) [proportionally slightly wider (Fig. 36)]; apex of male antenna without spot [with ferruginous spot]; metasomal tergum 1 in dorsal view (Fig. 41) gradually and weakly widened posteriorly, with apical width 1.9 × the basal width [only slightly widened posteriorly, with apical width 1.7 × the basal width (Fig. 42)].

Distribution. Indonesia: Sumba, Flores.