Dietzel Gyula: A Bakony természettudományi kutatásának eredményei 21. - A Bakony nappali lepkéi. (45 színes fotóval) (Zirc, 1997)

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rő and Kálmán Szedke from this subregion. None of the aforementioned species have so far been found in the Northern subregion. The Southern Bakony The Southern Bakony is a transitional zone for both flora and fauna. With an mean altitude of 300 metres this area lies between the Balaton Highlands and the mountainous Northern Bakony. The notable exception is the basalt uplift known as Mt. Kab which rapidly ascends to an altitude of 600 metres. Its massive base leads to exposed limestone cliffs and isolated meadows creating a variety of habitats suitable for numerous butterfly species. As with the previous two subregions this area is heavily forested especially on the North facing hillsides near the Szentgál Mountains and the Városldd-Ajka boundary. Fraxinus, Quercus and Fagus dominate and in comparison to the other subregions the South facing hillsides experience a more Mediterranean climate. Euphydryas aurinia ROTT, and Lycaena alciphron f. hellenore DIETZEL can be found flying locally over dry hillsides. Colias chrysotheme ESR, Euphydryas maturna LINN., Brenthis hecate SCHIFF, and Maeulinea alcon SCHIFF, also fly in this region. Habitat destruction relating to forestry mismanagement has almost certainly led to the extinction of Neptis rivularis and a similar fate awaits Brenthis ino simulatrix DIETZEL which has become extremely rare in recent years and is on the verge of extinction. The South-west is divided into two distinct areas; the Balaton Highlands and the Keszthely Mountains. The Balaton Highlands With an mean elevation of between 300-350 metres this district receives more reliable rainfall than the other regions of the Bakony. The Highlands can be divided into three altitudinal subzones, a) Lake Balaton and the coastal mountain peaks and ridges b) The NagyvázsonyVeszprém breakline c) The peaks of Agárteto, Mt. Kab, Mt. Papod and Mt. Öreg-Futóné. The Highland forest is comprised primarily of Cotinus, Cornus and Crataegus bushes but within this deciduous zone Quercus cerris and Fraxinus ornus can also to be found. Many butterfly species usually associated with Mediterranean and Submediterranean climates occur within this region.. Libythea celtis LAICH, was commonly seen in the Koloska Valley in 1993 and Pieris ergane has also been recorded from this zone. Colutea arborescens growing on the South facing slopes of the Balaton Highlands supports local colonies of Iolana iolas OCHS. A small dark form of Maeulinea arion once found on the Southern slopes of Mt. Tamás is now believed to be extinct. Zerynthia polyxena SCHIFF, appears to be heading the same way and is on the verge of extinction in its preferred biotopes. Due to forest mismanagement and unsympathetic agricultural practices much of this region's natural wealth has been destroyed. Keszthely Mountains These mountains rising to 450 metres are composed of weathered dolomite and are climatically exposed to many varied weather conditions. The accumulation of rock has led to the formation of many sheltered and exposed habitats. Although the rock is weathered dolomite the soil is very thin and lacks organic matter. The vegetation is, however, very mixed with Fraxinus and Tilia growing in the more sheltered areas and Fagus forest growing on the more exposed North facing slopes. Very little fieldwork has so far been carried out in what promises to be one of the more interesting regions of the Bakony.