S. Mahunka szerk.: Folia Entomologica Hungarica 64. (Budapest, 2003)

RESULTS AND DISCUSSION Larvae of Rhabdiopteryx hamulata were found in three streams of the foothills of the Mátra Mountains. Both male and female adults were successfully reared from larvae collected in the Monostor-patak (^stream), so the identification of the larvae was confirmed. At this stream, a few adult females were captured in the field as well. Several times (25.03.2000, 21.03.2001, 25.03.2003) we tried to collect this species at the localities mentioned by Újhelyi (1975) (Királyrét, Nagy-Vasfazékpatak) and at the nearby streams (Bagoly-bükki-patak, Török-patak, Szén-patak), but neither adults nor larvae were found. Faunistical data - Dorogháza: Dorogpuszta, Lengyendi-patak, 210 m, 03.04.1999, 1 female larva. - Gyöngyössolymos: Cserkő-bánya, Monostor-patak, 270 m, 28.02.1995, 7 male and 6 female larvae; 20.03.1999, 1 male and 3 female larvae; 11.03.2001, 4 male and 1 female larvae; 11.03.2001, 1 larva breeding, emerged 1 male adult in 11.03.2001, 16.03.2001, 3 male and 5 female larvae, 1 male and 2 female exuviae; 16.03.2001, 1 larva breeding, emerged 1 female adult in 18.03.2001,20.03.2001, 1 male exuvium, 1 female adult; 25.03.2001, 1 female adult; 31.01.2002, 2 male and 3 female larvae; 14.03.2002, 2 male and 4 female larvae; 14.03.2002, 3 larvae breeding, emerged 1 male and 2 female adults in 14.03.2002, 26.03.2002, 1 larva breeding, emerged 1 female adult in 27.03.2002, 15.11.2002, 7 larvae; 22.02.2003, 1 male and 4 female larvae; 23.03.2003, 1 male larva; 01.04.2003, 2 female larvae; 01.04.2003, 2 larvae breeding, emerged 2 female adults from 02.04.2003. to 03.04.2003, 16.04.2003, 1 male and 1 female larvae, 1 female exuvium. - Gyöngyössolymos: Cserkő-bánya, Nagy-patak, 268 m, 14.01.2001, 1 male and 3 female larvae; 14.03.2002, 2 male exuviae. The collector was T. Kovács in all cases. Voucher specimens listed above are preserved in 70% ethanol and deposited in the Mátra Museum (Gyöngyös, Hungary). As well as adults (see lilies 1957), the larvae of R. hamulata are highly similar to those of R. thienemanni (good description and figures of the latter see Zwick 1972). Larvae of both species are reminiscent of the genus Brachyptera (Fig. 1). The light spot of vertex, pronotal colour pattern (Fig. 2), male paraprocts, tergite 10 and epiproct are also similar in the two species. The end of abdomen of R. hamulata can be seen in Fig. 3. Length of male larvae of R. hamulata is 7.5-9.7 mm, that of female larvae 8.2-11.1 mm. Generally speaking, larvae of A*, hamulata are about 1 mm larger than those of R. thienemanni. The most important distinguishing feature is the shape of ventral plates. The subgenital plate of male R. hamulata is broadening to half of the length, then strongly tapering with concave sides, and apex is arcuate (Fig. 4). The subgenital