Isoperla sowerbyi Wu & Claassen, 1934

Isoperla sowerbyi Wu & Claassen, 1934 . Bull. Pek. Soc. Nat. Hist., 9(2): 115; Wu, 1935a. Catalogus Insectorum Sinensium, 1: 301; Wu, 1938b. Plecopterorum Sinensium, a monograph of the stoneflies of China (Order Plecoptera): 45; Claassen, 1940. Mem. Cornell agric. Exp. Sta., 232: 206; Illies, 1966. Das Tierreich, 82: 421; Yang & Li, 2018. Species Catalogue of China. Vol. 2. Animals, Insecta (III), Plecoptera: 49.

Type information. Holotype male, China: Jilin Province, Yalu River, 1914. V.

Remarks. Only female of this species is known, characterized by a broad and rounded subgenital plate, covering most part of sternum 9 (Fig. 1M; see fig. 5 in Wu & Claassen 1934). However, this character is common in Isoperla and the male needs to be associated and described. The female holotype is lost (Wu 1962). Color pattern: head pale, with a dark spot covering the three ocelli; pronotum dark brown, with a broad pale median stripe and with pale lateral margins; legs pale; ventral surface of body pale (Wu & Claassen 1934). Isoperla sowerbyi was considered a synonym of I. lunigera by Zwick (1973b, c). Neotypes need to be designated to support this conclusion.