Arthrolytus usubai Kamijo 1981

Arthrolytus usubai KAMIJO, 1981 (Figs 1g, 2k, 3j)

T y p e m a t e r i a l s: Holotype ♀, Kita-Asaka, Saimata-ken, emerged -. iv. 1980, ex gall of Neuroterus sp., Leg. S. Usuba. Paratypes: Honshu: 11♀♀ 13♂♂, same data as the holotype; Urawa, Saitama-ken, emerged -. Xii. 1978. Leg. S. Usuba. The types were deposited in the Entomological Institute, Hokkaido University, Sapporo.

D i a g n o s i s: ♀: Antenna (Fig. 1a) with combined length of pedicel and flagellum equal to breadth of the head; 2.3x as long as scape.anelli plus F1 1.44x as long as pedicel; pedicel 0.82x as long as F1; club 1.64x as long as F1. Malar space 0.30x length of an eye. POL 1.8 OOL. Forewing (Fig. 3j) with stigmal vein forming angle 45 o with the postmarginal vein; marginal vein 1.3-1.5x stigmal vein; post marginal vein 0.9x as long as marginal vein. Propodeum medially 0.33x as long as scutellum, median area transversally elevated and finely strigose-reticulate, with apical and basal foveae deep and large; with distinct median carina, plicae sherp posteriorly, indicated anteriorly bybasal foveae; nucha occupying1/4 median length of propodeum, well defined in front, weakly and transversally sculptured. Legs brownish yellow, except coxae concolorous with mesosoma; tarsi darker at apex.

♂♂: Smilar to ♀ except as follows: Anterior margin of clypeus truncate; Antenna (Fig. 2k) with pedicel 1.7-1.9x as long as broad, 0.6x as long as F1; flagellum 2.68x length of scape; F1 2.28x as long as broad 1.78x as long as pedicel; 1.23x as long as F2; F6 1.33x as long as broad; club 3.13x as long as broad 1.56x length of F1. Number of linear sensillae on F1 and F2 1; F3 2; F4 and F6 3-4; C1 and C2 3 sensillae; Propodeum with median carina strong, plicae sharp posteriorly, indicated anteriorly by basal foveae; dorsum of Metasoma with a large brown spot basally; forewing with a cloud slightly darker.

D e s c r i p t i o n:givenbyKAMIJO (1981).

H o s t: reared from galls of Neuroterus sp. on leaves of Quercus acutissima.

D i s t r i b u t i o n: Japan: Honshu.