Enicospilus nigristernalis sp. nov.

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Fig. 53

Diagnosis

Interocellar area reddish brown; clypeus weakly convex, ventral margin blunt; mandible twisted ca 40°, outer surface without a diagonal setose groove; fore wing fenestra with proximal, central and distal sclerites, central sclerite small, circular, positioned in anterodistal corner of quadra, both CI and ICI less than 0.5; mesoscutum posteriorly and mesosternum black.

Differential diagnosis

The new species resembles E. stenophleps Cushman, 1937 in having a small, weak, circular central sclerite. The new species can be recognized from the latter by the narrower fenestra, anterodistal corner antefurcal to RS by about 0.8× length of 2rs-m (vs interstitial to RS in E. stenophleps), with quadra (vs without quadra in E. stenophleps), and colour patterns of mesoscutum, mesosternum and metasomal tergites.

Etymology

The adjective belonging to the Latin neuter noun ‘ sternum ʼ is ‘ sternalis ʼ, combined with black the specific epithet ‘ nigristernalis ʼ meaning ‘black sternumʼ, referring to the black mesosternum.

Material examined

Holotype

VIETNAM • ♂; Dong Nai Province, Vinh Cuu, Phu Ly; 7 Jun. 2021; Pham T.N., Hoang V.T. and Pham V.P. leg.; light trap; IEBR

Paratypes

VIETNAM • 1 ♀; Dong Nai Province, Cat Tien NP; 7 Jul. 2002; Le X.H. leg.; light trap; IEBR • 2 ♀♀, 1 ♂; Dong Nai Province, Vinh Cuu, Phu Ly; 16 May 2007; Hoang V.T. leg.; light trap; IEBR • 1 ♀; Cuc Phuong NP, Ninh Binh Province; 11 Jun. 2022; Pham V.P. leg.; light trap; IEBR .

Description

Male (holotype)

MEASUREMENTS. Body length 14.1 mm, fore wing length 10.5 mm.

HEAD with FI = 0.6, GOI = 4.0 (Fig. 53d). Lower face 0.7 × as wide as high, smooth and shiny (Fig. 53b). Clypeus 1.4× as wide as high, similar sculpture as face, weakly convex in profile, ventral margin blunt (Fig. 53b). Malar space 0.3× as long as basal mandibular width (Fig. 53b). Mandible moderately short, twisted by ca 40°, evenly narrowed, outer surface without diagonal setose groove (Fig. 53b). Upper tooth of mandible depressed, about 1.2 × as long as lower tooth (Fig. 53b). Frons and vertex smooth and shiny, gena shiny with fine setae (Fig. 53c–d). Posterior ocellus close to eye (Fig. 53c). Occipital carina complete, ventral end meeting hypostomal carina at about 0.5 × basal mandible width from base of mandible. Antenna broken, with 46 remaining flagellomeres; F1 1.5× as long as F2; F20 2.5× as long as wide.

MESOSOMA. Moderately shiny (Fig. 53e). Pronotum coriaceous (Fig. 53e). Mesoscutum 1.4× as long as maximum width, evenly rounded in profile. Notaulus absent. Scutellum moderately convex, anteriorly with transverse wrinkles, posteriorly with irregular rugae, lateral longitudinal carinae present on anterior 0.9. Epicnemium coriaceous ventrally, dorsally with transverse wrinkles (Fig. 53e). Epicnemial carina moderately strong, dorsal end bent to reach anterior margin of mesopleuron (Fig. 53e). Mesopleuron finely punctate dorsally, ventrally transversely striate (Fig. 53e). Submetapleural carina slightly broadened anteriorly (Fig. 53e). Metapleuron coriaceous (Fig. 53e). Propodeum evenly rounded in profile; anterior transverse carina complete; anterior area longitudinally striate; spiracular area smooth; posterior area irregularly rugose; propodeal spiracle elliptical, joining pleural carina by ridge (Fig. 53e).

WINGS (Fig. 53f). Fore wing with AI = 0.57, CI = 0.33, DI = 0.28, ICI = 0.43, SDI = 1.19, SI = 0.16, SRI = 0.22; vein 1m-cu&M evenly arcuate; vein 2r&RS relatively straight; vein RS strongly curved; fenestra and sclerites of discosubmarginal cell as in Fig. 53f; proximal sclerite strong, connected to weakly pigmented distal sclerite; central sclerite small, more or less round in shape, pigmented, positioned in anterodistal corner of moderately large quadra; proximal corner of marginal cell evenly setose; posterodistal corner of second discal cell and that of subbasal cell ca 90°; vein 1cu-a antefurcal to M&RS by 0.15× length of 1cu-a. Hind wing with NI = 2.8; vein RS arcuate; vein RA with 7 uniform hamuli on right wing and with 6 uniform hamuli on left wing.

LEGS. Hind leg with coxa in profile 1.7× as long as high; basitarsus 1.6× as long as second tarsomere; fourth tarsomere 2.4× as long as wide; tarsal claw simply pectinate.

METASOMA. With DMI = 1.6, PI = 2.3, THI = 3.1; thyridium oval.

COLOUR (Fig. 53a). Reddish brown except for apex of mandible, posterior 0.4 of mesoscutum, mesosternum, and posterior half of T3 onwards black. Wings hyaline; sclerites pigmented and amber; veins and pterostigma dark brown.

Variation in male

Paratype male has fore wing length 11.2 mm, ICI = 0.42, SDI = 1.24. Metasoma with DMI = 1.4, PI = 2.5.

Females

Similar to male, except head with FI = 0.6; antenna with 50–53 flagellomeres; fore wing length 10.5– 15.0 mm, AI = 0.61–0.83, CI = 0.33–0.44, ICI = 0.42–0.49; SDI = 1.24–1.26; metasoma with DMI = 1.4–1.5, PI = 2.6–2.7, THI = 3.8, ovipositor sheath not longer than posterior height of metasoma.

Distribution

Currently known from Ninh Binh Province, North Vietnam and Dong Nai Province, South Vietnam.