S. Mahunka szerk.: Folia Entomologica Hungarica 46/1. (Budapest, 1985)

stout short spines around its apex. Phallic apparatus consisting a long slightly downcurving schlerotized tube, stout spine like short parameres with downcurving and tapering apices and a short membranous aedeagus with sclerotized insertion as figured. (Aedeagus and parameres slightly pulled out from phallobase with pincers.) Fig. 3. Psilotreta pyonga sp. n. A: Male genitalia, lateral, B: dorsal, C: phallic apparatus, lateral, D: ventral, E: Wings In the structure of genitalia this species resembles P. falculata Botosaneanu, 1970 described also from Korea, but has close relation both to P. kisoensis Iwata, 1928 and P. locumtenens Botosaneanu, 1970. All these four species form a group of closely related species with well-defined, however clear differences as was established by BOTOSANEANU (1970). My new species has definite characters differing from the most closely related P. falculata at least if I compare it with the fine drawings of BOTOSANEANU. Nevertheless a direct comparison of the two species would be desirable. There are differences in the form of ventral body of ninth segment in the lateral lobes of tenth tergite, in the median dorsal process of ninth tergite, as well as also in the sclerotic insertion of the aedeagus. Unfortunately, I was unable to compare the venations, which is so characteristic for P. pyonga, with the drawings published for the genus. The description of P.fal culata has no wing drawings. I named this new species after the province where it was collected. Holotype 6. Korea, Prov. North Pyongan, Mt. Myohyang-san, Hotel Myohyang-san, 14.VII. 1982, No. 788, leg. FORRÓ et RONKAY. Deposited at the Zoological Department, Hungarian Natural History Museum, Budapest. Right pair of wings mounted as dry microscopic preparation.Caustic potash-treated abdomen and the remaining part of the body stored in a single airtight selfstanding vial with 70 % ethanol.