O. G. Dely szerk.: Vertebrata Hungarica 4/1-2. (Budapest, 1962)

Topál, Gy.: A magyarországi denevérek ivararánya 141-163. o.

males; 60,5 per cent of 209 Rhinolophua hippoaidero

s ; 50,5 per cent of 15510 Myotis oxygnathu

s, 42,5 per cent of 26 Myotla daubenton

i /a three years mean/, and 48,5 per cent of 3127 Miniopterus schreibers

i. The data as summarized in the present paper are as yet insufficient for any far-reaching conclusions, but it is a striking fact that females dominate in the populations of bat species whose maternity wards are in warm, sheltered caves. These species have, at the same time, an expressed southern range. Nor is Rhinolophus euryal

e an exception, while the two other Rhinolophids are our very bat species in whose Hungarian populations the outnumbering of males, according to the available data, is the most explicit. Irodalom 1. ABDULALI, H.: Sex ratios in Indian bats /Journ. Bombay Nat. Hist. Soc., 48, 1949, p. 423-427/. - 2. BEAUCOURNU, J. C.: Contribution a l'inventaire faunistique des cavités souterraines de l'Ouest de la Prance, Mammifères /Bull. Soc. Sei. Nat. Ouest de la France, 54, 1958, p. 5-16/. - 3. BELS

, L.: Fifteen years of bat banding in the Netherlands /Publ. Natuurh. Gen., 5, 1952, p. 1-99/. - 4. DAVIS, W. H.

: Disproportionate sex ratios in hibernating bats /Journ. Mamm.

, 40, 1959, p. 16-19/. - 5. EISENTRAUT, M.: Die deutschen Fledermäuse. Eine biologische Studie /Leipzig, 1937, pp. 184/. 6. EISENTRAUT, M. : Die mit Hilfe der Beringungsmethode erzielten Ergebnisse über Lebensdauer und jährliche Verlustziffern bei Myotis myotis Borkh. /Experimentia, 3, 1947, p. 157-160/.- 7. GRUBT, M. Sc DUFOUR, J. : Étude sur les Chauvessouris troglodytes du Maine-et-Loire /Mammalia, 13, 1949, p. 69-75/. - 8. HITCHCOCK, H.B.: Sex ratio in hibernating bata /Nat. Speleol. Soc. Bull., 10, 1950, p. 26-28/. - 9.