Pristaulacus ohishii, Konishi & Matsumoto, 2019

Konishi, Kazuhiko & Matsumoto, Rikio, 2019, Two new species of the genus Pristaulacus (Hymenoptera, Evanioidea, Aulacidae) from Japan, Zootaxa 4551 (4), pp. 445-454 : 446-447

Pristaulacus ohishii sp. n.

( Figs 1–16 )

Type material. Holotype: ♀, “ Nara Park, Nara Ci., Nara Pref., JAPAN, 4-vi-1994, Hisashi OHISHI leg.”, “H. Oishi Collection, 15. ix. 2001, [01-9]”, (OMNH). Paratypes: 1♂, same data as for holotype except date, 12. vi. 1993, (OMNH); 1♂, same data as for holotype, (OMNH); 1♂, same data as for holotype except date, 13. vi. 1994, (OMNH); 1♀, same locality as for holotype, xii. 2007, S. Fujie, ex. 24. iv. 2008 from dead wood of Litsea coreana H. Léveillé , (OMNH); 1♀, Hirose-keikoku, Susami Town, Wakayama, Honshu, Japan, 11. i. 2016, S. Fujie, ex. pupal cell of Leptoxenus ibidiiformis Bates, 1877 in lumber of Litsea coreana H. Léveillé , (OMNH); 1♀, Mirodu, Susami Town, Wakayama, Honshu, Japan, S. Fujie, (EUMJ); 6♂, Ômasu, Kami-tsushima, Tsushima Island, N34.61 E129.45, 10 m asl, 15. vi. 2015, Y. Komeda, (4♂ in EUMJ, 2♂ in OMNH).

♀. Body length 10.1–11.8 mm (11.8 mm); fore wing length 7.7–9.0 mm (9.0 mm); ovipositor length 6.5–8.2 mm (8.2 mm).

Color. Black ( Fig. 1 ); ventral side of scape brownish yellow ( Fig. 7 ); apical 2/3 of mandible brown ( Fig. 3 ); fore and mid legs reddish yellow except coxae; basal and apical portions of hind femur and tibia yellowish brown; hind tarsus whitish yellow; metasoma with ventral half of 1st segment, 2nd segment and ventral half of 3rd segment brownish red; ovipositor brown. Wings ( Figs 12 & 13 ) hyaline and tinged with brown; stigma and veins of fore wing and R+Rs of hind wing brown; M+Cu of hind wing weakly pigmented; r-m, 2M and Cu of hind wing pale brown; distal 2/5 of 1st submarginal cell, basal 1/6 of marginal cell and basal 1/2 of 2nd submarginal cell except along 2-M brown. Setae on body yellowish white; setae on legs white except hind tibia brown.

Head ( Figs 3–6 ) polished and punctulate with setae; face, clypeus and gena densely punctate with setae; head in dorsal view, 1.2× as wide as long, with occipital margin strongly and roundly concave, depth of occipital emargination much shorter than wide, temple weakly and roundly convergent posteriorly, temple 0.8–0.9 (0.8)× as long as eye; occipital carina with a dorso-median interruption as wide as basal width of 1st flagellomere ( Fig. 6 ); the interruption faintly concave, and smooth or weakly rugose (smooth); occipital carina at most 0.2× diameter of ocellus. POL/OOL=0.9. Antenna ( Fig. 7 ) with 1st flagellomere 3.4–3.9 (3.4)× as long as wide; 2nd flagellomere 5.7–5.8 (5.7)× as long as wide and 1.6× as long as the 1st. Basal 2/3 of outer face of mandible covered with punctures with setae, without densely punctate area.

Mesosoma ( Figs 9–10 ) strongly areolate rugose; propleuron entirely punctate; median lobe of mesoscutum transversely carinate with a pair of submedian longitudinal carina on front surface; anterior half of scutellum transversely carinate and posterior half punctulate. Latero-ventral margin of pronotum with one tooth-like process. Anterior margin of mesoscutum, in lateral view, rounded. Fore wing ( Fig. 12 ) 2.9–3.1 (3.0)× as long as wide; 1-Rs 0.9–1.1 (1.1)× as long as 1-M; 2-rs+m moderately long; 3r-m vertical; 2m-cu inclivous. Fore coxa punctate; mid and hind coxae trans-striate with minute punctures between striae; hind basitarsus 1.1–1.2 (1.1)× as long as remaining tarsomeres combined; tarsal claw with 4 tooth-like processes ( Fig. 11 ).

Metasoma with 1st and 2nd tergites smooth and without setae, 3rd to apical tergites weakly punctate with dense and short setae. Ovipositor 0.8–0.9 (0.9)× as long as fore wing.

♂ ( Fig. 2 ). Similar to female except body length 8.5–12.7 mm; fore wing length 6.3–8.7 mm. Metasoma black; anterior 4/5 of 2nd segment, anterior 2/3 of 3rd segment and anterior half of 4th segment brownish red. Antenna ( Fig. 8 ) with 1st flagellomere 3.1–3.4× as long as wide, 2nd flagellomere 5.1–5.4× as long as wide and 1.7× as long as the 1st. Fore wing ( Fig. 12 ) with 1-Rs 1.1– 1.4× as long as 1-M. Hypopygium ( Fig. 14 ) with a short basal apodeme and apical margin weakly convex. Paramere ( Fig. 15 ) with basal portion not strongly broadened, weakly tapering toward truncate apex; digitus relatively slender and with dorsal margin rounded. Aedeagus ( Fig. 16 ) with penis valve curved and slightly tapering toward rounded apex.

Distribution. Japan (Honshu, Tsushima Island).

Biology. One female was found in the pupal cell of Leptoxenus ibidiiformis Bates, 1877 ( Coleoptera , Cerambycidae ) in lumber of Litsea coreana H. Léveillé (family Lauraceae ). Thus, this cerambycid is thought to be a host of P. ohishii .

Etymology. This species is named in honor of Mr. Hisashi Ohishi, who collected the holotype.

Remarks. This new species possesses a strongly concaved occipital margin and thus it is considered to be a member of the comptipennis species group as defined by Turrisi & Smith (2011). In this species group, P. ohishii is peculiar in having the occipital carina interrupted and a broadly rounded and shallow occipital medial groove. Among the Japanese Pristaulacus , this new species resembles P. intermedius from Tsushima Island due to the black body with reddish markings on metasoma; however, they can be easily distinguished by the shape of head, absence of occipital medial groove, and reddish yellow fore and mid legs (black in intermedius ).

Figures

FIGURES 1–2. Pristaulacus ohishii sp. n., habitus in lateral view: 1, female (paratype); 2, male (paratype).

FIGURES 3–8. Pristaulacus ohishii sp. n., paratypes: 3–6, head of female; 3, frontal view; 4, dorsal view; 5, lateral view; 6, postero-dorsal view to show interruption of occipital carina; 7, antenna of female; 8, antenna of male.

FIGURES 9–10. Pristaulacus ohishii sp. n., mesosoma of female (paratype): 9, dorsal view; 10, lateral view.

FIGURES 11–13. Pristaulacus ohishii sp. n.: 11, hind tarsal claw of female (paratype); 12, fore wing of male (paratype); 13, hind wing of male (paratype).

FIGURES 14–16. Pristaulacus ohishii sp. n., male (paratype): 14, hypopygium; 15, right paramere; 16, aedeagus.