Review of the genera Stethorus and Parastethorus from Japan (Coleoptera: Coccinellidae)

Abstract

Japanese species of the genera Stethorus Weise, 1885 and Parastethorus Pang & Mao, 1975 (Coleoptera: Coccinellidae: Coccinellinae) were reviewed, recognizing seven species of the former and one species of the latter genus. Two new species are described: Stethorus (Allostethorus) takakoae sp. nov. from Hokkaido and Parastethorus pinicola sp. nov. from Honshu, Kyushu, and the Ryukyu Islands. Stethorus (Stethorus) japonicus Kamiya, 1959, syn. nov., and S. (S.) aptus tsutsuii Nakane & Araki, 1959, syn. nov., are synonymized with S. (S.) siphonulus Kapur, 1948. Stethorus (A.) chengi Sasaji, 1968 and S. (A.) parapauperculus Pang, 1966 are newly recorded from Japan (both from the Ryukyu Islands). The holotype specimens of S. (A.) chengi Sasaji, 1968, S. (A.) emarginatus Miyatake, 1966, S. (A.) yezoensis Miyatake, 1966, S. (S.) aptus tsutsuii Nakane & Araki, 1959, and S. (S.) japonicus Kamiya, 1959 were examined, and all species are redescribed or diagnosed. Additionally, diagnostic characters are illustrated together with distribution maps. The larvae and pupae of the new species P. pinicola sp. nov. are also illustrated.