Hedychridium arensi Rosa, 2017

Rosa, P., Proshchalykin, M. Yu., Lelej, A. S. & Loktionov, V. M., 2017, Contribution to the Siberian Chrysididae (Hymenoptera). Part 2., Far Eastern Entomologist 342 (342), pp. 1-42 : 14-16

Hedychridium arensi Rosa , sp. n.

Figs 5A–F

SPECIMENS EXAMINED. Holotype – ♀, Russia: Tuva Rep., 31 km NEE

Erzin, Erzin River , 18.VII 2014 (AL, MP, VL) [ ZIN]. Paratype: 1♀, same data as holotype [ PRC] .

DIAGNOSIS. Hedychridium arensi sp. n. belongs to the ardens species-group.

It is similar to H. ardens (Coquebert, 1801) for general habitus; it differs through face unusually flat with peculiar sculpture: frons, in frontal view, with scattered,

small punctures, 0.5–2.0 PD apart, and polished interspaces; punctures on face with rugulose interspaces; scapal basin medially with fine cross ridging (vs. face fully punctate in H. ardens ); it can be also separated through body coloration and pubescence: body dorsally metallic red to green-rosy, including metanotum and propodeum, without contrasting blue or green areas (vs. metanotum and propodeum generally contrasting in H. ardens ); metasoma ventrally black, without metallic spot

(vs. medially on S2 with defined, metallic red spot); laterally on metasoma with long setae (2 MOD) (vs. 0.5-1 MOD). A similar microsculpture on face, with rugulose interspaces, and body coloration is observed in H. karatavicum Semenov,

1967, H. miramae Semenov, 1967 , and H. ciliatum Semenov, 1967 . H. ciliatum is distinct through coarse punctures on frons, without polished interspaces; it has light brown F1 and F2 (vs. black in H. arensi ); scapal basin partially covered with silvery, short, appressed setae (vs. without visible setae); larger and dense punctures on metasoma (vs. tiny and scatterd). H. karatavicum has longer antennae, with cylindrical flagellomeres (vs. short and stout); long, silvery setae covering outer sides of scapal basin and malar spaces (vs. without visible setae); denser punctuation on mesosoma. Finally, H. miramae has denser punctuation on mesosoma, laterally contiguous (vs. sparse, with large polished interspaces on the whole surface).

Pictures of all Semenov’s types are available in Rosa et al. 2017a.

DESCRIPTION. Body length 4.5–5.2 mm. Fore wing length 3.2–3.5 mm.

Female. OOL = 2.2 MOD; POL = 2.3 MOD; MS = 0.7 MOD; relative length of P:

F1: F2: F3 = 1: 1.1: 0.7: 0.6.

Head. Vertex with small, nearly contiguous punctures (0.1–0.3 MOD): frons, in frontal view, with scattered punctures, 0.5–2 PD apart, with polished interspaces

( Fig. 5A ); face laterally with dense, minute punctures, gradually decreasing towards clypeal margin, with rugulose interspaces; scapal basin medially with fine cross ridging. Ocellar triangle isosceles; midocellus anteriorly sunken, posterior ocelli laterally sunken.

Mesosoma. Pronotum with irregularly sized punctures, with minute punctures on interspaces. Mesoscutum and mesoscutellum with similar, yet more scattered punctures, with polished interspaces; here and there with few minute punctures ( Fig.

5C). Mesopleuron with large, contiguous punctures ( Fig. 5B ). Metascutellum with areolate-reticulate punctures ( Fig. 5D ). Propodeal teeth spine-like, with sharp angle pointing backward. Forewing medial vein twice as long as RS stub, clearly arched at basal third.

mesosoma, lateral view; C – mesosoma, dorsal view; D – mesosoma, detail, dorsal view; E –

metasoma, dorsal view; F – metasoma, lateral view. Scale bar = 0.5 mm.

Metasoma. T1, T2 and T3 with minute, sparse punctures, 1–4 PD apart; laterally with lacunose punctures, interspersed with minute ones. T3 posterior margin with hyaline rim (0.2 MOD).

Coloration. Body dorsally metallic red to rosy-red; green on scapal basin; on propleuron, mesopleuron, metanotum and propodeum green to rosy-greenish; anteromedially on T2 darker to purplish. Metasoma ventrally black, without metallic area on S2. Scape and pedicel shiny black, without metallic reflections, flagellum blackish. Tegulae brown, non-metallic. Wings medially smoky.

Vestiture. Head, mesosoma and metasoma dorsally with sparse, whitish, short setae (>1 MOD), mesosoma and metasoma laterally with very long setae (> 2 MOD).

Legs with long (2 MOD), erect setae on coxa, trochanter and femur, and with short erect setae on tibae (<1 MOD).

Male. Unknown.

DISTRIBUTION. Russia (Tuva Rep.).

ETYMOLOGY. The specific epithet arensi (masculine name in genitive case) is dedicated to Werner Arens (Bad Hersfeld, Germany), expert chrysidologist, who considerably contributed to the study of the genus Hedychridium among others.

Figures

Fig. 5. Hedychridium arensi Rosa, sp. n., holotype, ♀: A – head, frontal view; B –