Genus Eurycryptus Cameron, 1901

Eurycryptus Cameron, 1901: 231 . Type species: Eurycryptus laticeps Cameron, 1901 . Monobasic.

Alriada Cameron, 1911a: 176 . Type species: Alriada spilocephala Cameron, 1901 . Monobasic.

Neotorbda Uchida, 1932a: 153. Type species: Torbda (Neotorbda) sakaguchii Uchida, 1932 . Original designation.

Didiaspis Seyrig, 1952: 189 . Type species: Didiaspis fondamentalis Seyrig, 1952 . Original designation.

In Japan, the following two species have been recorded. I recognize some new distribution records and record these data below. In addition, I examined the types of Gerdius iriomotensis Kusigemati, 1986 (Figs. 7I–L), and found misidentification of the generic position. Original description of this species notes that this species with a pleural carina of propodeum present between anterior transverse carina, while this is misregard based on the concavity with refraction of light for pleural carina. The pleural carina of this species absent (Figs. 2A, D) and thus the generic position should be placed in Eurycryptus . Kusigemati (1986) recorded Afrotropic genus, Gerdius Townes, 1970, from Oriental region based on this species and no additional species had been recorded from this region. Thus the distribution record of Gerdius in Oriental region is deleted here.

Eurycryptus sakaguchii (Uchida, 1932) is one of rare species in Japanese cryptini and only a single female (holotype) from “ Okinawa ” collected in 1922 (Figs. 7E– H), had been known from Japan. Recently I found an additional female specimen in NIAES and recognized the intraspecific color variation, i.e., blackish brown area of mesosoma and metasomal tergites varied in size (Figs. 7A, C–G, I–K). In addition, the variation shows that this species and G. iriomotensis are same species. The character states of both species are also overlapped. Thus, I conclude that both species are same and G. iriomotensis is newly synonymized under E. sakaguchii (syn. nov.).