Psychomyia

Ito, Tomiko, Ohkawa, Ayuko & Hattori, Toshio, 2011, The genus Hydroptila Dalman (Trichoptera, Hydroptilidae) in Japan, Zootaxa 2801, pp. 1-26 : 22-23

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.

Figures

FIGURE 13. Female of Psychomyia sp. (Psychomyiidae). Type specimen of H. usuguronis Matsumura, 1931. A—label pinned together with the specimen; B—label put on the specimen box; C—wings; D—abdominal segments VII – X, ventro-lateral.