Dryinus expolitus Xu, Olmi & He, 2007

Mita, Toshiharu, 2009, A taxonomic study of the Dryininae (Hymenoptera: Dryinidae) of Japan, with description of a new species of Pseudodryinus, Zootaxa 2168, pp. 45-56 : 49

Dryinus expolitus Xu, Olmi & He, 2007

( Figs. 5–8 )

Dryinus expolitus Xu, Olmi & He : 454. Type locality: Jianfengling National Nature Reserve, Hainan Isl. (P. R. China).

Material examined. 1F, Kamakura, Kanagawa, JAPAN, 11. IX, 1948, H. Nagase leg. ( ELKU); 1F, same locality as above, except 2. IX. 1950 ( ELKU); 1F, Jokoji, Seto, Aichi, JAPAN 15. IX. 2000, M. Suzuki leg. (YPT) ( ELMU); 1F, Mt. Tachibana-yama, Fukuoka, Kyushu, JAPAN, 27. VI. 1976, K. Ueda leg. ( ELKU); 1F, Imakira-dake, Takara-jima Isl., Tokara Isls., Ryukyus, JAPAN, 1. VI. 2005, J. Kantô leg. ( ELKU); 1F, Komi, Iriomote-jima Isl., Ryukyus, JAPAN, 26. XII. 2006, T. Ishizaki leg. ( ELKU); 1F, Takeda-rindô, Ishigaki-jima Isl., Ryukyus, JAPAN, 14. VI. 2005, M. Satô leg. ( ELKU); 1F, Shiramizu, Ishigaki-jima Isl., Ryukyus, JAPAN, 1–3. VII. 1993, K. Konishi leg. ( NIAES); 1F, Banna Park, Ishigaki-jima Isl., Ryukyus, JAPAN, 3–7. III. 1995, T. Matsumura leg. (Mst) ( NIAES); 1F, Ôtomi-rindô, Iriomote-jima Isl., Ryukyus, JAPAN, 19. VI. 2005, M. Satô leg. ( ELKU); 1F, Ôtomi-rindô, Iriomote-jima Isl., Ryukyus, JAPAN, 8. IV. 2005, H. Kojima leg., captured by fogging, from Castanopsis cuspidata (Thumb.) ( ELKU); 1F, Ushiku-mori, Iriomote-jima Isl., Ryukyus, JAPAN, 9. III. 1964, Y. Kurosawa leg. (Mst) ( ELKU); 1F, Mt. Urabu-dake, Yonaguni-jima Isl., Ryukyus, JAPAN, 2. I. 2007, T. Ishizaki leg. ( ELKU).

Distribution. JAPAN (new record): Honshu (Kanagawa; Aichi); Kyushu (Fukuoka); Northern Ryukyus (Tokara Isls.: Takara-jima Isl.); Southern Ryukyus (Ishigaki-jima Isl.; Iriomote-jima Isl.; Yonaguni-jima Isl.); P. R. CHINA.

Host. Unknown.

Remarks. The specimens collected from Japan are smaller than the holotype. Body length of the type is 6.3 mm, whereas it ranges from 3.8 to 5.3 mm in Japanese specimens; FIII of the type is 6.9x as long as the scape, compared with 3.3 to 4.4x in Japanese specimens. Specimens collected in the Southern Ryukyus are distinctive due to a combination of the following two characters: pronotum without striae around the disc ( Fig. 5 ) and a shiny and granulated mesepisternum ( Fig. 7 ), whereas the type and specimens from Northern Japan show a striate pronotum ( Fig. 6 ) and reticulated mesepisternum ( Fig. 8 ). A female from Iriomote-jima was collected from Castanopsis cuspidata (Fagaceae) using a fogging method. This species occurs in Oriental Japan (the Southern Ryukyus) and Palaearctic Japan (Honshu and Kyushu).

Figures

FIGURES 5 – 8. Dryinus expolitus (female). 5: Pronotum in lateral view (Southern Ryukyus). 6: Ditto (Honshu). 7. Mesepisternum (Southern Ryukyus). 8. Ditto (Honshu).