Euxiphydria vietnamensis Smith & Shinohara, 2011

Smith, David R. & Shinohara, Akihiko, 2011, Review of the Asian wood-boring genus Euxiphydria (Hymenoptera, Symphyta, Xiphydriidae), Journal of Hymenoptera Research 23, pp. 1-22 : 13

Euxiphydria vietnamensis Smith & Shinohara sp. n. Figs 30-35

Holotype.

Female, labeled "Deo O Quy Ho, 1750m, Sa Pa, Lao Cai Prov., Vietnam, 12-17.v.1995, A. Shinohara (NSMT).

Description.

Female. Length, 14.0 mm.

Color. Head red; black on ocellar area and extending posteriorly to near occiput through center of postocellar area ( Figs 33, 34 ). Abdomen black with white spot on side of eighth tergite ( Fig. 30 ). Legs black with basal third of hind tibia and hind basitarsomere white ( Fig. 30 ). Wings uniformly, lightly infuscated; hind wing somewhat more hyaline on basal half.

Head. Antenna with 19 antennomeres; length of first four antennomeres as 1.0:0.4:0.9:0.5. Frons with curved almost parallel carinae ( Fig. 34 ). Upper half of gena and vertex from posterior margin of lateral ocelli smooth, shiny. Malar space between eye and antennal groove narrow, much less than width of groove ( Fig. 34 ). Width of gena behind eyes about 1.4 × eye width. Head from above straight behind eyes, distance behind eyes slightly longer than eye length ( Fig. 33 ).

Thorax. Pronotum smooth and shiny anteroventrally, with irregular strong carinae dorsally and posteriorly ( Fig. 31 ). Mesoscutal middle lobe and inner margins of lateral lobes reticulate; outer lateral lobes with large smooth, shiny area ( Fig. 32 ). Axilla and mesoscutellum entirely sculptured, reticulate ( Fig. 32 ), mesoscutellum separated from axillae by broad, shiny punctures. Mesepisternum mostly reticulate; mesepimeron anteriorly almost smooth, posteriorly with large oval punctures; metapleuron reticulate ( Fig. 31 ). Metascutellum short, about 2 × broader than long, reticulate, straight posteriorly ( Fig. 32 ). Hind basitarsomere shorter than length of remaining tarsomeres combined, as 0.8:1.0.

Abdomen. Basal plates densely punctate anterolaterally, shiny and with few punctures on medial posterior portion ( Fig. 32 ); rest of abdomen shiny, finely punctate. Length of sheath slightly shorter than length of basal plate.

Male.

Unknown.

Etymology.

Named for the country of collection.

Discussion.

The white lateral spot on the eighth abdominal tergite, partly white hind tibia and hind basitarsomere, the curved, almost parallel carinae on the frons, the head in dorsal view long behind the eyes, and the completely sculptured axilla and mesoscutellum will distinguish Euxiphydria vietnamensis from other Euxiphydria species. This is the southernmost record for the genus.

Figures

Figures 30 - 35. Euxiphydria vietnamensis, holotype 30 Lateral view 31 Thorax, lateral view 32 Thorax, dorsal view 33 Head, dorsal view 34 Head, front view 35 Mouthparts (labial palpus on right, maxillary palpus on left).