Euchroeus victorius Rosa, 2017

Rosa, P., Proshchalykin, M. Yu., Lelej, A. S. & Loktionov, V. M., 2017, Contribution to the Siberian Chrysididae (Hymenoptera). Part 1., Far Eastern Entomologist 341 (341), pp. 1-44 : 4-8

Euchroeus victorius Rosa , sp. n.

Figs 2B , 3A–F , 4E–F

SPECIMENS EXAMINED. Holotype – ♂, Russia: Khakassia Rep., 20 km SW

Abakan, Izykhskie Kopi, 7.VII 2014 (AL, MP, VL) [ZIN].

DIAGNOSIS. Euchroeus victorius sp. n. belongs to the purpuratus speciesgroup (Linsenmaier, 1959). It is easily recognizable through the short, truncate teeth on the apical margin of T3 ( Figs 3D, F ) and the shape of the genital capsule (Figs

4E–F). In the north-African E. doursi Gribodo, 1875 teeth are also short, but sharp and triangular, not truncate, and the genital capsule is different (see Linsenmaier,

1959: Fig. 214). In Central Asia E. kyrgyzicus (Tarbinsky, 2000) also has short teeth, but they are hyaline, contrasting with the metallic coloration of T3, as in E.

eous (Semenov, 1912), whereas apical teeth of E. victorius sp. n. are fully metallic,

without hyaline or whitish areas. Other species known for Siberia show long apical teeth (e.g. E. purpuratus (Fabricius, 1787) , Figs 4C–D ) and different genital capsule

( Figs 4G–H ).

DESCRIPTION. Male. Body length 8.3 mm. Fore wing length 5.2 mm. OOL =

2.7 MOD; POL = 2.3 MOD; MS = 1.6 MOD; relative length of P: F1: F2: F3 = 1:

1.7: 1.4: 1.4.

Head. Frons and vertex with small, contiguous punctures ( Fig. 3A ); frons moderately depressed between midocellus and TFC; TFC medially raised with median acute prominence ( Fig. 3A ), not observed in other species (TFC M-shaped in E.

purpuratus ( Fig. 4A ), E. orientis (Semenov, 1910) , E. vesper (Semenov, 1910)) ; only

n.; C – Pseudochrysis incrassata (Spinola) ; D – P. gengiskhan sp. n.; E – P. fahringeri

Trautmann. Scale bar = 1.0 mm.

pleuron, lateral view; C – mesosoma, dorsal view; D – metasoma, dorso-lateral view; E –

metasoma, dorsal view; F – metasoma, posterior view. Scale bar = 1.0 mm.

E. mongolicus Tsuneki, 1947 has a median prominence, but scapal basin is fully and densely punctate and the species is easily recognizable for the different body color. Scapal basin largely impunctate, in the upper part, for 3 MOD width, wholly polished, then weakly rugulose medially, only in the lower half also with sparse tiny punctures (medially polished only for 1 MOD width in E. purpuratus and E.

orientis, fully punctured with tiny dots in E. vesper ); scapal basin laterally with small punctures and without tiny dots; subantennal space 2.6 MOD.

Mesosoma. Mesoscutum with punctures increasing in size towards posterior margin, with narrow, polished interspaces, 0.1–0.3 PD apart ( Fig. 3C ); with smaller punctures toward tegulae. Tegulae mostly impunctate or with shallow, ill-defined punctures. Notauli and parapsidal furrow complete. Mesoscutellum antero-medially impunctate, elsewhere with deep, large, foveate-reticulate punctures ( Fig. 3C ). Metascutellum with large foveate-reticulate punctures. Mesopleuron with large episternal sulcus ( Fig. 3B ) subtended by the anterior large, acute tooth: posterior tooth short and blunted.

Metasoma. T1 with small- to medium-sized punctures (0.3–0.5 MOD), sparse,

0.5–1.0 PD apart, with micropunctate interspaces. T2 with smaller punctures and micropunctate interspaces; T2 dorso-median line impunctate and with tiny dots on its lateral margins ( Fig. 3E ); punctures on posterior margin rugulose; T3 with small and shallow punctures; T3 with large pre-pit swelling and pit-row with large, round and deep pits (0.5–1.0 MOD); posterior margin with numerous irregular and apically truncate, short teeth ( Figs 3D, F ). Genital capsule Figs 4E–F .

Coloration. Body blue to deep blue, with greenish reflections on face, mesopleuron and legs; tegulae blue; tarsi yellowish. Mandible medially yellowish; scape and pedicel metallic green, flagellum black. Forewings slightly brownish.

Vestiture. Whitish setae on head, 1.4 MOD long, dense on vertex; face with shorter

(about 1 MOD), appressed silvery setae along eye margin; mesosoma with sparse whitish setae, about 1 MOD long; metasoma with short (0.5 MOD) and erect setae.

Female. Unknown.

DISTRIBUTION. Russia (Khakassia Rep.).

ETYMOLOGY. The specific epithet victorius (masculine noun in apposition) is dedicated to Vittorio Rosa (1940–1999), Italian entomologist and father of the first author, to whom he transmitted the interest for Chrysididae .

Figures

Fig. 2. Habitus, dorsal view. A – Euchroeus purpuratus (Fabricius); B – E. victorius sp.

Fig. 3. Euchroeus victorius Rosa, sp. n., holotype ♂: A – head, frontal view; B – meso-

Fig. 4. A–D, G, H – Euchroeus purpuratus (Fabricius), Khakassia Rep.: A – head, frontal view; B – mesopleuron, lateral view; C – mesosoma, dorsal view; D – metasoma, posterolateral view; G – genital capsule, dorsal view; H – genital capsule, ventral view; E, F – E. victorius Rosa, sp. n. E – genital capsule, dorsal view; F – genital capsule, ventral view. Scale bar = 1.0 mm.