Szekessy Vilmos (szerk.): A Magyar Természettudományi Múzeum évkönyve 60. (Budapest 1968)
Kovács, L.: Data to the knowledge of Hungarian Macrolepidoptera III. New taxa from the subfamily Hadeninae
by the draining of swampy bodies of water and the regulation of river-courses. It is. surely owing to these facts that the species has not been encountered in the last 100 years, despite very intense collectings, in Peszér, its erstwhile southernmost locality between the Danube and the Tisza. Toward the west and the east, however, heavily wooded hilly and mountainous regions stand in the way of its expanse. The rate of advance is here blocked, explaining also the relative overpopulation of its centres in the west and the north. It is to be ascribed to a push with a climatical background, effeoting an intensive earlier wandering, that the resulting advance had penetrated (as witnessed by the still living populations) exceptionally deep into the area of the Alps. In all likelihood, this had coincided with the "hazel-period", the warmest interval of the present interglacial. Phenological data. The activity graph (14) based on the data gathered for an extensive period by the continuously operating light-traps, displays at the first glance that the species has two distinct annual broods (Graph 1.). 60 Graph. 1. Activity curve of Hyssia gozmanyi sp. n. (based on light trap data) The earliest observation of gozmanyi n.sp. refers to 3 May, the last individuals; of the first generation were captured on 30 June. Subsequent to 13 June, it was notobserved on every day. The earliest date of the appearance of the second brood is 7 July. During the period 10 July — 26 August, we have data for every day, and then only one observation each for 28, 30, 31 August. An individual appearing on 26 September, 1966, had probably indicated the commencement of an abortive third generation. The transitional period between the two broods, during which imagos appeared but sporadically, comprises 26 days, whereas none were as yet observed between 16—23 June and 1—6 July. The second brood predominates in every respect over the first one. Ever since the beginning of the light-trap surveys, the first generation was observed on 175 days, of which most fell between 17—30 May (92 flight days),, whereas the second appeared in 291 days, the maximum having been 151 flight days between 28 July— 12 August. The spring peak (10 observations) is on 22 May, the summer one (11 observations each) on 5, 6, 8 August. The ratio of individual numbers emphasizes still more the preponderance of the second brood. Of the 1922 specimens caught by the light-traps, 362 represent the first generation, the other 1560 the second brood. Our home populations belong therefore to those bivoltine species for which the conditions of the winter areconsiderably less favourable than those of the summer (14).
