The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan Author Ito, Tomiko Author Ohkawa, Ayuko Author Hattori, Toshio text Zootaxa 2011 2801 1 26 journal article 10.5281/zenodo.202293 4efe3866-f68a-4aed-89c7-054ca3e21c7b 1175-5326 202293 Psychomyia sp., Psychomyiidae ( Fig. 13 ) Hydroptila usuguronis Matsumura, 1931 , 1136 , female, Japan (Hokkaido, Honshu). Reassignment . A small female caddisfly (body length 3.2 mm , forewing length 3.0 mm) was deposited in the collections of the Systematic Entomology, Faculty of Agriculture, Hokkaido University (Sapporo), accompanied by 2 labels: (1) A red label bearing words “ Type Matsumura,” and (2) a white label in S. Matsumura’s handwriting with the name “ Hydroptilus sapporonis .” The pinned female was in a small box with another label in the same hand-writing, bearing the following: “ Hydroptila sapporensis usuironis Mats. ” Since Matsumura described only 1 hydroptilid caddisfly species and this is the only small type specimen with his red label in the caddisfly collections, we deduce that the female is the type specimen of Hydroptila usuguronis Matsumura, 1931 . Although the species name on the labels does not coincide with the name published by Matsumura (1931) , we infer based on the labels that he changed his mind, giving the name as sapporonis , followed by sapporensis , to usuironis , and finally to usuguronis . Observations on the female clearly show that this is not referable to Hydroptila Dalman but corresponds with Psychomyia Latreille , Psychomyiidae , on the basis that (1) the terminal segment of each maxillary palp is different in structure from preceding segments, has numerous transverse annulations, and is greater than twice as long as the penultimate segment; (2) the 2 mesoscutal setose warts are small, ovoid; (3) the foretibiae each lack a preapical spur; (4) the basal segment of each tarsus is longer than twice the length of apical spur; and (5) a characteristic bulge is present at about 1/3 length of the anterior margin of the hind wing.