Dictyopterygella frequens Matsumura 1905

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Dictyopterygella frequens Matsumura 1905, Illustrated as an exemplification of Plecoptera, fig. 111 in page 187. — Matsumura 1907. p. 52 & plate 38; Matsumura 1931a. Illustrated as an exemplification of Plecoptera in page 1420; Brinck 1954, p. 199; Illies 1966, p. 511, treated as nomen dubium; Kawai 1976, p. 40, treated as nomen nudum.

Dictyogenus frequens (Matsumura): Kohno 1964, p. 34.

This species is now treated as a nomen dubium and the status is still questionable. Matsumura (1907) described the characteristics of this species as follows: body dark brown, vertex of head and median line of prothorax yellow; wings greyish white and sub- hyaline, rather reduced venation, bearing 8 crossveins between media and cubitus 1, and 5 cross- veins between cubitus 1 and 2; legs and cerci dark yellow; body length 9-12 mm and wing expanse 27-33 mm long.

Matsumura (1907) probably measured from dry specimens. Also, he commented that this species was as common as Nemoura japonica Matsumura at that time. The color looks similar to that of the genus Stavsolus, but no information on the locality is given in his description. Still, the identity of this species cannot be settled without his specimens.