A new species of the genus Ostrovus Ricker, 1952 (Plecoptera: Perlodidae) from northern Kyushu, Japan, with notes on the male drumming signal

A new species of the genus Ostrovus Ricker, 1952 is described from northern Kyushu, Japan, on the male and female adults, the egg, and the male drumming signal. The new species is distinguished by blackish body and wings and the male epiproct tip having a sclerotized semicircular dorsal top and a beak-shaped apex in lateral view. Male drumming calls were produced by percussive tapping of the ventral lobe and had a grouped bi-beat signal pattern. In addition, the characteristics of the new species and two known species, Ostrovus mitsukonis (Okamoto & Kohno, 1940) and Ostrovus nikkoensis (Okamoto, 1912) are summarized, and the morphological characteristics of male and female adults of O. mitsukonis and O. nikkoensis are illustrated.