The identity of Syndiamesa alpina Goetghebuer, 1941 (Diptera: Chironomidae)

The type material of Syndiamesa alpina Goetghebuer has been examined and found to comprise a mixed series of Diamesa spp. The specimen originally figured by Goetghebuer is designated as lectotype and the species is considered as synonymous with Diamesa vaillanti Serra-Tosio. Because Diamesa alpina (Goetghebuer) is a junior homonym of D. alpina Tokunaga, the name D. vaillanti should be applied for the species. The remaining specimens of the syntype series include D. zernyi Edwards, D. incallida (Walker), and a previously undescribed female possibly belonging to D. nowickiana Kownacki & Kownacka.