Euperilampus sinensis Boucek , 1978

Mitroiu, Mircea-Dan & Koutsoukos, Evangelos, 2023, Perilampus neglectus and other neglected species: new records of Palaearctic Perilampidae (Hymenoptera, Chalcidoidea), with a key to European species of Perilampus, Journal of Hymenoptera Research 96, pp. 57-99 : 57

Euperilampus sinensis Boucek, 1978

Fig. 1

Euperilampus sinensis Bouček, 1978: 305.

Diagnosis.

Both sexes. Body black, without any metallic reflections (Fig. 1A, B ); femora dark (Fig. 1A, B ); fore wing slightly infumate (Fig. 1G ). Labio-maxillary complex only slightly protruding beyond closed mandibles (Fig. 1C, D ). Dorsal side of mesosoma without any rugae (Fig. 1E, F ). Inner axillular margins almost parallel (Fig. 1E, F ). Sides of scutellum steep in posterior part (Fig. 1E, F, H ). Posterior scutellum projection truncate to emarginate (Fig. 1E, F, H ). Marginal vein more than 1.5 × as long as stigmal vein (Fig. 1G ). Female. Flagellum dark orange, claval apex slightly darker (Fig. 1A, C ); tibiae blackish brown (Fig. 1A, C ). Male. Flagellum dorsally dark brown, ventrally dark reddish-brown (Fig. 1B ); tibiae dark brown except distal third getting yellowish-brown or brownish yellow on inner side of fore tibia (Fig. 1B, D ). Clypeus with short setae, anterior tentorial pits slightly to distinctly visible (Fig. 1D ). Antennal scape normal, not laminate or foliaceous (Fig. 1D ).

Material examined.

South Korea : 2♀, 2♂, "S. KOREA, GYONGBUK, Ulleungdo, trail in forest, from Nari Basin to Seonginbong Peak / 500-1000 m, 16.VIII.2010, P. Tripotin rec." (MICO) .

Description.

Female. Body length: 4.5-5.0 mm. Colour. Body black, without any metallic reflections (Fig. 1A ). Body setation brown on dorsal side of mesosoma and whitish on clypeus and face (Fig. 1C, E ). Scape and pedicel black; flagellum dark orange, claval apex brownish (Fig. 1A, C ). Eyes brown, ocelli dark orange to brown (Fig. 1C ). Mandibles dark reddish brown (Fig. 1C ). Labio-maxillary complex dark brown. Legs with coxae, trochanters, femora and tibiae blackish brown; knees, extreme tibial apices and most tarsal segments reddish brown; basal tarsal segments and apical segment dark brown (Fig. 1A, C ). Tegula dark brown. Fore wing slightly infumate (Fig. 1G ).

Head. Striae on vertex, parascrobal areas, temples and genae generally strong and dense (Fig. 1C, E ). Scrobes with their lateral carinate margins strongly converging both downwards and upwards, very slightly sinuate in the upper part (Fig. 1C ). Supraclypeal area poorly defined, subquadrate, slightly convex in middle, its lower corners setose (Fig. 1C ). Clypeus nearly flat, with strongly diverging lateral margins, densely setose, anterior tentorial pits indistinct; both upper and lower clypeal margins conspicuously emarginate; setae much longer than distance between dense piliferous punctures; clypeus surface apart from piliferous punctures with fine but conspicuous transverse striae, most visible on sides (Fig. 1C ). Piliferous punctures on basal halves of mandibles less dense than those on the clypeus. Labio-maxillary complex protruding beyond clypeal margin to about 1.8 × breadth of left mandible (Fig. 1C ). Scape very slightly curved and widened distally, without any laminate expansion, its maximum width about 0.7 × maximum width of flagellum (Fig. 1C ); flagellum subfusiform, funicular segments 1-4 longer than wide (length of first segment 1.25-1.33 × width), 5 subquadrate, 6-7 transverse; clava shorter than the three preceding segments (Fig. 1A ).

Mesosoma. Pronotal collar in middle about 0.3x as long as mesoscutum. Both pronotal collar and mesoscutum regularly punctuate-reticulate, without smooth areas except for a narrow band at posterior margin of pronotal collar (Fig. 1E ). Scutellum as coarsely sculptured as mesoscutum except lateral sloping sides with much coarser reticulation; scutellum from very slightly longer than wide to virtually as long as wide; lateral margins almost parallel; postero-lateral sided steep, slightly concave; terminal protruding process slightly (smaller female) to conspicuously emarginate (larger female) (Fig. 1E ). Propodeum with carinate spiracular sulci and triangular median depression, the latter with a slightly indicated median carina; median propodeal area irregularly striate; spiracles narrow, reniform. Fore wing with parastigma and marginal vein slightly widened (Fig. 1G ). Marginal vein 1.6-1.7 × as long as stigmal vein; postmarginal vein about 2.8 × as long as marginal vein, but apical end difficult to define.

Metasoma. Wider than long, much shorter and wider than mesosoma (Fig. 1A ). Posterior margin of first tergite virtually straight; second gastral tergite 2.2-2.6 × as wide as long; anterior 1/3-1/4 and anterior 1/2 of second and third tergites respectively with a transverse band of very shallow piliferous punctures.

Male. Differs from the female mainly as follows. Body length: 4 mm. Flagellum dark reddish brown, ventrally slightly lighter, claval apex darker (Fig. 1B ). Tibiae dark brown, gradually becoming yellowish brown on apical third on outer surface and brownish yellow on most inner surface of fore tibia; tarsi entirely yellowish brown except dark brown arolia and claws (Fig. 1B, D ). Longitudinal striae on upper face (between upper third of eye and scrobes) shallower and more irregular (Fig. 1D ). Lateral margins of scrobes less strongly converging upwards (Fig. 1D ). Setae on upper half of clypeus shorter (Fig. 1D ), their length only slightly greater than distance between piliferous punctures. Anterior tentorial pits slightly to distinctly visible (Fig. 1D ). Flagellum thicker (Fig. 1B ); length of first funicular segment 1.11-1.15 × width. Scutellum longer, length about 1.3 × maximum width, terminal protruding process only very slightly emarginate (Fig. 1F ). Posterior margin of first tergite broadly emarginate. Piliferous punctures on gastral tergites two and three deeper. For additional information, see the description of the male in Bouček (1978).

Hosts.

Unknown.

Distribution.

Peoples’ Republic of China. New genus and species to South Korea.

Comments.

As stated in Darling (1983), Euperilampus differs from other perilampid genera mainly in the prepectus size, and in having a distinctly shorter marginal vein, compared to the postmarginal vein. There are currently three species of Euperilampus known from East Palaearctic: E. scutellatus , E. sinensis and E. spina ( Noyes 2019). So far, the females of E. sinensis and E. spina have been unknown. Following Bouček’s key (1978) we have identified the above listed specimens as being closest to E. sinensis . However, the almost indistinct anterior tentorial pits shed some doubt about the identification. Further clarification came after the examination of images of the male holotype of E. sinensis , kindly provided by Natalie Dale-Skey (NHMUK). The male specimens we examined differ from the holotype mainly in having (1) tentorial pits barely visible (versus conspicuous); (2) longitudinal striae on upper face (between scrobes and upper third of eye) shallow and irregular (versus stronger and regular); (3) clypeus aside from piliferous punctures slightly more sculptured (versus almost smooth); and (4) body setation very dense (versus sparser). The latter difference is probably just a conservation artifact, given the considerably older age of the holotype, in which the bare piliferous punctures indicate that many of the setae have fallen. The other differences are most probable due to intraspecific variability. However, they may indicate a new species, but without any females for comparison and without any evidence about the intraspecific variability of E. sinensis , its validity cannot be correctly assessed at present.

Figures

Figure 1. Euperilampus sinensis A female, habitus in lateral view B male, habitus in lateral view C female, head in frontal view D male, head in frontal view E female, mesosoma in dorsal view F male, mesosoma in dorsal view G female, fore wing H male, scutellum in dorso-lateral view.