Parathalassius maritimus Shamshev

Parathalassius maritimus Shamshev, 1998: 6.

Material examined. JAPAN: Hokkaido, Shari, 3.viii.1967, T. Saigusa (2♂, 1♀, CNC); Kyushu, Fukuoka, Camp Hakata, 1–3.vi.1955, H. Lyman (1♂, EMEC).

Diagnosis. This medium sized Palaearctic species is characterized by a short-subtriangular antennal postpedicel, uniformly short male ommatrichia, white to pale yellow setae on the lower part of the head, 2 notopleural bristles, pale legs, hyaline wing, and left ventral epandrial process of the male hypopygium bifurcate with slender hook-shaped dorsal arm and sclerotized flattened serratulate apex on ventral arm.

Distribution. This eastern Palaearctic species is known from the Kuril Islands (Kunashir) in the Russian Far East (Shamshev 1998) and is here newly recorded from Japan, from Hokkaido and Kyushu.

Remarks. In his description of P. maritimus from the Kuril Islands, Shamshev (1998) indicated that the larger setae on the head and thorax of this species are brown compared with the smaller setae that are whitish. In contrast, the specimens from Japan have the larger setae on the head and thorax pale yellow, rather than brown.