Taxonomic information on some Japanese Chironomidae (Diptera) described by Dr. M. Sasa (†) Author Yamamoto, Nao Author Yamamoto, Masaru text Zootaxa 2018 2018-11-09 4514 4 516 528 journal article 27979 10.11646/zootaxa.4514.4.5 b6786141-b3af-4df8-838b-6ecea1fd2810 1175-5326 2609358 CA29ED01-E74F-4DBB-AB6D-5055A03949BF Chironomus ( Chironomus ) claggi Tokunaga, 1964 ( Figs. 10–14 ) Chironomus claggi Tokunaga, 1964 : 563 ; Sasa & Suzuki, 1997 : 319 . Chironomus simantobeceus Sasa, Suzuki et Sakai, 1998: 49 . syn. n. Specimens examined: Japan : Tokyo Metropolitan , Bonin Isles , Chichijima Is. , ♂ ,? 14. iv. 1996 ; [specimen No. 307:04]; Bonin Isles, Chichijima Is. , ♂ , 14. iv. 1996 [specimen No. 307: 04] and Hahajima Is. , ♂ , 20. iv. 1996 , H. Suzuki [specimen No. 308: 02] ; Kochi Pref., Nakamura , Shimanto River (near mouth), holotype ♂ of Chironomus simantobeceus , 25. v. 1998 , M. Sasa [specimen No. 360:01 (NSMT-I-Dip-5222)] . Chironomus claggi superficially resembles C . flaviplumus Tokunaga and C . yoshimatusi Martin et Sublette , but is well-separable from both these species in having much slender superior volsellae. Although the species also resembles C . cirucumdatus in the shape of the superior volsella, and the uniformly coloured scutal vittae in the former. The morphological features of C . simantobeceus are quite identical with those of C . claggi described by Tokunaga (1964) . Furthermore, we observed many pseudospurs on mid and hind tarsomeres in specimen named C . simantobeceus in Sasa, Suzuki and Sakai (1998) . This is the first record of the species from one of the main Japanese islands, Shikoku.