S. Mahunka szerk.: Folia Entomologica Hungarica 62. (Budapest, 2001)

CHLOROPERLIDAE Chloroperla tripunctata (Scopoli, 1763) — Pilis Mts: Andrikovics 1988. Xanthoperla apicalis (Newman, 1836) — Bakony Mts: Pongrácz 1911; Budapest: Mocsáry 1900. Siphonoperla transsylvanica (Kis, 1963) — Zemplén Mts: Újhelyi 1969. Siphonoperla torrentium (Pictet, 1841) — Pilis Mts: Aubert 1966, Újhelyi 1969; Börzsöny Mts: Újhelyi 1969; Mátra Mts: Aubert 1966. Siphonoperla neglecta (Rostock, 1881) — Pilis Mts: Újhelyi 1969; Börzsöny Mts: Újhelyi 1969, 1975; Mátra Mts: Újhelyi 1975; Zemplén Mts: Újhelyi 1969. Siphonoperla burmeisteri (Pictet, 1841) — Danube bend: Újhelyi 1969. ísoptena serricornis (Pictet, 1841) — Bakony Mts: Újhelyi 1979. Two stoneflies partly documented and with old publication data Leuctra prima Kempny, 1899 — Newly found in Mátra Mts: Domoszló, Tarjánkapatak [creek], February 14. 1998., 7 (6+1); March 21. 1998., 50 (21+29); Parádfúrdő, Ilona-patak [creek], March 28. 1998., 28 (15+13); Bükk Mts: Nagyvisnyó, Nagy-völgyipatak [creek], February 17. 1998., 27 (14+13); Nagyvisnyó, Bán-patak [creek], February 17. 1998., 5 (2+3); April 1. 1998., 13 (5+8); Zemplén Mts: Füzér, Nagy-patak [creek], March 14, 1998., 5 (2+3). (Figs 2 a-e) Leuctra prima is a widespread species in West and Middle Europe, abundant between 300-2000 meters above sea level (Kis 1974). The places of its occurrence in Hungary are 250-600 meters. The valleys of the creeks face different direction (north, southwest and south). L. prima was found in narrower, cooler parts of each of the five creeks bordered with beech and alder. The width of Nagy-völgyi and Tarjánka-patak [creek] were half meter and its depth was 1-2 centimeters, while the lower part of Ilona-patak [creek] was 2-3 meters wide. Current in the creeks varied from the runny, lotie section to slowly flowing, lentic parts. The bottoms of the creeks were mostly stony (volcanic or limestone) or sandy. L prima occurred on stony bottom, and disappeared, where the bottom was covered whit a thick layer of fallen leaves or mud. L. prima swarms from midFebruary to end of April. Probably it is due to the early swarming that L. prima has not been found previously in Hungary. This year the first L. prima imagoes swarmed together with Capnia bifrons. The first L. prima specimens sat on stones covered with snow in sunny, warm weather. Swarming in large numbers occurred in the second half of March, when they were present in huge numbers all along the examined creeks, together with C. bifrons and Protonemura praecox in the Mátra and Bükk Mountains and with Leuctra pseudosignifera in the Zemplén Mountains. There were always more L. prima imagoes present than the previously mentioned other species. Sometimes they were found far from the water, but they always stayed in the forest. Last swarming imagoes were flying together with Leuctra hippopus, Nemoura sciurus and Nemoura cambrica. There was no collecting site, where L. prima was the only Plecoptera species, although it occurred also in the not abundant sites of the creeks, where Gammarus species have replaced nearly all other species. L. prima is distinguishable from other Leuctra species by its early swarming, although there were problematic L, prima andL. pseudosignifera imagoes in the Zemplén Mts.