Exallonyx strictus Liu, He & Xu, 2006

Liu J., He J. - H. & Xu Z. - F., 2006, Two new species of Exallonyx Kieffer (Hymenoptera: Proctotrupidae) from China, with a key to Chinese species., Zootaxa 1142, pp. 35-41 : 36-37

Exallonyx strictus Liu, He & Xu , new species

(Figs. 1-6)

Diagnosis of Male

Temple 0.65 as long as eye in dorsal view; the second and tenth flagellar segments each 2.7, 2.0 as long as wide; tyloids absent; abdominal petiole as long as deep in lateral view, upper margin straight, distinctly contracted at base, without distinct transverse wrinkles at under side, its posterior half with six diagonal longitudinal ridges in lateral view.

Description of Male (holotype)

Front wing 2.0 mm long. Body black. Antenna black brown. Labrum, apical half of mandible, palpus and tegula fulvous. Leg blackish brown to black, except fore femur, base and apex of mid femur, apex of hind femur fulvous. Wing hyaline, stigma and strong veins light brown; weak veins indistinct. Temple 0.65× as long as eye in dorsal view. Gena 0.3× as long as long diameter of eye. Clypeus 3.0× as wide as long, weakly convex; its apex truncate with weak transverse ridges on subapical declivity. Second flagellar segment 2.7× as long as wide. Tenth flagellar segment 2.0× as long as wide. Last segment of antenna 1.6× as long as penultimate segment. Tyloids absent. Area between antennal sockets with weak ridge. Occipital carina distinct. Pronotum with 4-5 transverse wrinkles on collar. Epomia strong. Pronotum smooth laterally, without setae behind epomia, but with setae behind carina on collar. Upper margin of pronotum with single row of setae. Lower corner of pronotum with two pits. Upper half of mesopleuron nearly asetose except front edge of mesopleuron with group of setae on upper corner and upper 0.3 of speculum with sparse setae. Lower half of mesopleuron mostly with long sparse setae except for median area asetose; lower corner without parallel wrinkles posteriorly. Smooth area of metapleuron with sparse punctures, 0.5× as long as metapleuron and 0.8× as deep as metapleuron. Remainder of metapleuron weakly reticulate. Upper margin of propodeum arcuate in lateral view. Pair of smooth areas present on upper face of propodeum reaching far behind propodeal spiracle; some small punctures present along median ridge and lateral margin. Median ridge incomplete, reaching to middle of posterior face. Posterior face of propodeum irregularly reticulate, with strong transverse ridge at its middle. Lateral areas of propodeum areolate. Hind femur 4.2× as long as deep. Longer spur of hind tibia 0.64× as long as hind basitarsus. Stigma 1.7× as long as deep receiving radius nearly at middle. Anterior side of radial cell 0.6× as long as depth of stigma; posterodistal margin of stigma weakly convex. First radial vein approximately straight, 1.1× as long as wide. Second radial vein straight, meeting first radial vein without projection. Posterior margin of hind wing with shallow notch at basal 0.35. Abdominal petiole 1.2× as long as wide in dorsal view with five strong parallel longitudinal carinae and four longitudinal grooves. Abdominal petiole as long as deep in lateral view; upper margin straight, distinctly contracted at base; anterior half weakly striae without transverse ridge, posterior half with six diagonal strong longitudinal ridges. Base of syntergite with median groove reaching 0.75 to space between thyridia, each side with two short lateral grooves, 0.33× as long as median groove. First thyridium 2.2× as wide as long, separated from each by 0.33 width of one thyridium. Setae on syntergite short and sparse; sockets of lowest setae separated from lower margin of syntergite by 1.6 to 2.0× setal lengths. Paramere triangular, very short and straight, sharp at tip.

Female. Unknown.

Type material

Holotype male, China, Henan Province: Song County (34.08°N, 112.05°E), Baiyun Mountain , 19. VII.1996, coll. Ping CAI, No.973066 . Paratypes: 1 male, China, Shaanxi Province: Qinling (34.14°N, 106.54°E), 3.IX.1999, coll. Junhua HE, No.990204 ; 1 male, China, Shaanxi Province: Zhouzhi (34.10°N, 108.12°E), 2-3.VI.1998, coll. Yun MA, No.981455 ; 1 male, China, Gansu Province: Dangchang County (34.04°N, 104.21°E), 31.VII.2004, coll. Qiong WU, No.20047022 .

Distribution

China (Henan, Shaanxi and Gansu Provinces).

Etymology

The specific epithet is derived from the Latin adjective strictus (narrow) which refers to the fact that basal portion of abdominal petiole is distinctly contracted.

Remarks

This species is easily separated from all other species by having the basal portion of the abdominal petiole distinctly contracted and the underside without a transverse ridge. Also, the posterior half of abdominal petiole has six longitudinal ridges.