Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)

Kovács, L.: Data to the knowledge of Hungarian Macrolepidoptera VI. Data with respect to migrating and spreading species

number of individuals arriving in May is low, the majority of specimens arrive only from the middle of June. Not uncommonly the first phase of the immigration may fail to occur. The majority of the immigrated specimens remain between our borders and breed to produce two further, a second and a third, generations. The development of a fourth brood is only exceptional in Hungary. The second generation flies from the middle of summer, the third one during the autumn. Our data fail to indicate whether the specimens emerged during the autumn return by the onset of the cold weather to the warmer southern regions. Our autumns are habitually mild and the exigua females may undisturbedly oviposit still within the breeding period. 3. Nycterosea ( —Orthonama) obstipata F. Light trap data The species occures everywhere in Hungary. Only four of our light traps failed to capture it yet, these, however, had operated only temporarily or been installed but recently (Map 7). It should be remarked that adjacent traps (at a distance of 12—22 km) have already caught the species. Most of the specimens derive from the Southeastern Transdanubia and the southern part of the Great Plains. If the annual average individual number per light trap is considered, one should also add to the region rich in individuals the southern section of the Transdanubia up to the river-head of the Zala, as well as the hilly environs of Buda and the Mts. Vértes (Map 8). Individual numbers are lower in the northern part of the Transdanubia and especially the northern region of the Plains and in that of the Central Range. The data referring to distribution Map 7. Nycterosea obstipata F. — Individual numbers per light trap