Hedychridium longigena 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 : 21-23

Hedychridium longigena Rosa , sp. n.

Figs 8A–F , 13I, J

SPECIMENS EXAMINED: Holotype – ♀, Russia: Irkutsk Prov., 8 km N Irkutsk,

Angara River, sandy slopes, 10.VII 2001 [ ZIN]. Allotype – ♂, same data as holotype [ ZIN] . Paratypes: 5♀, 2♂, same data as holotype [ GLA, PRC] .

DIAGNOSIS. Hedychridium longigena sp. n. is similar to H. propodeale for general habitus and coloration. It differs through: shape of head, in frontal view,

longitudinally elongate with subparallel malar spaces ( Fig. 8A ) (vs. triangularly shaped with convergent malar spaces in H. propodeale ( Fig. 6A )); shorter POL (1.6

MOD) (vs. 2.1 MOD in H. propodeale ); triangular, acute propodeal angles, ( Fig. 8 )

(vs. short and blunt ( Fig. 6D )); genitalia ( Figs 13I–J ); tegulae metallic green in female (vs. non-metallic). It is separated from H. rhodinum Semenov for the elongate malar spaces (1.3 MOD) (vs. 1 MOD); F1 (1.3 MOD) (vs. 1 MOD). It differs from

H. gabriellae sp. n. for shape of head; body coloration (entirely shining red, including

T1 anterior declivity in H. gabriellae , flagellum ventrally light brown); shape of propodeal angles (narrow and digitate in H. gabriellae ) and shape of genital capsule.

Lastly all examined specimens of H. longigena sp. n. have T3 extremely short,

reduced, almost fused to T2 ( Fig. 8D–F ).

DESCRIPTION. Body length 3.5–4.0 mm. Fore wing length 2.2–2.4 mm.

Female. OOL = 1.8 MOD; POL = 1.6 MOD; MS = 1.3 MOD; relative length of P:

F1: F2: F3 = 1: 1.3: 0.8: 0.7.

Head. Face nearly flat, evenly convex from midocellus to upper face; face densely punctuate throughout; frons with contiguous small punctures; punctuation on lower face with minute dots; scapal basin medially cross-ridged. Clypeus elongate, subantennal space 1.7 MOD ( Fig. 8A ). Facial longitudinal midline barely visible only on upper scapal basin. Punctuation on post-ocellar vertex with small,

dense and irregular punctures. Ocellar triangle isosceles and posterior ocelli with pit along external margin ( Fig. 8C ).

Mesosoma. Pronotum, mesonotum and mesoscutellum with coarse, irregularly sized and contiguous punctures ( Fig. 8C ). Metascutellum with large and contiguous areolate punctures. Propodeal teeth triangle shaped, with acute teeth. Forewing basal vein 1.3 times as long as RS stub, almost straight.

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

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

Metasoma. T1 and T2 with dense and medium-sized punctures, almost contiguous

( Fig. 8E ); T3 very narrow, almost fused with T2: only the tip of the apical margin and the narrow semitransparent rim are visible ( Figs 8D, F ).

Coloration. Head and body dorsally metallic red, with some brassy reflections,

with the only exception of greenish to blackish median part of propodeum, in some paratypes the greenish area on propodeum is more extended. Holotype with small darker to blackish area dorsally on T2. Body ventrally dark bronze, metasoma ventrally black. Scape and pedicel shiny black, with metallic sheen on scape,

flagellum blackish. Tegulae metallic greenish. Wings hyaline or darker to ambrate in some specimens.

Vestiture. Body with sparse, whitish and short setae (1.0 MOD), on metasoma laterally with appressed and erect setae, and a little longer (> 1.0 MOD). Setae short, erect on legs.

Male. Similar to female, without metallic tegulae. Genital capsule as in Figs 13I, J .

DISTRIBUTION. Russia (Irkutsk Prov.).

ETYMOLOGY. The specific epithet longigena (a noun in apposition) derives from the Latin longus (long) and gena (cheek) and refers to the elongate and subparallel malar spaces.

REMARKS. The shortened T3 seems diagnostic for this species. However,

other Siberian specimens show the reduction of the last visible tergum. In some specimens of H. ardens (Coquebert) is even observed the complete fusion between

T2 and T3, as in the case of Oligogaster kimseyae Soliman, 2013 .

Figures

Fig. 8. Hedychridium longigena Rosa, sp. n., holotype, ♀: A – head, frontal view; B –

Fig. 13. Male genital capsule. A – Hedychridium ardens (Coquebert), Khakassia; B – H.

Fig. 6. Hedychridium propodeale Rosa, sp. n., holotype, ♀: A – head, frontal view; B –