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: Der Abendsegler /Die Neue Brehm-Bücherei, Leipzig, 1951, pp. 40/. - 11. MOHR, C. E.: A survey of bat banding in North America, 1932-1951 /Nat. Speleol

. Soc., Bull., 14, 1952. p. 3-13/. - 12. FEARSON, 0. P., K0F0RD, M.R. & PEARSON, A.K. : Reproduction of the lumpnosed bat /Corynorhinus rafinesqui/ in California /

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., 33, 1952, p. 272-320/. - 13. RICE, D.W.: Life history and ecology of Myotie austroriparius in Florida /Journ. Mamm., 38, 1957, p. 15-32/. - 14. SLUITER, J.W., VAN HEERDT, P.

F. & BEZEM, J.J.

: Population statistics of the bat Myotis mystacinus, based on the marking- recapture method /'Arch. Néerl

. de Zool., 12, 1956, p. 63-88/. - 15. SMITH, E.

: Experimental study of factors affecting sex ratios in the little brown bat /Journ. Mamm., 38, 1957, p. 32-39/. - 16. T0PÁL, G.: Migration of banded bats in Hungary /Ann. Hist.Nat. Mus. Nat. Hung., ser. nov. 7, 1956, p. 477-489/. - 17. TWENTE, J. W., JR.: Aspects of a population study of caverndwelling bats /Journ Mamm., 36, 1955, p. 379-390/. Explanation of figures: Fig. 1. The constitution, according to months, of the sex ratios of fviyotis oxygnathu

s populations hibernating in the Ördöglyuk Cave of Szoplak. Fig. 2. The alteration in the sex ratios of ringed Myotis oxygnathu

s populations.hibernating in the Ördöglyuk Cave of Szoplak, in the years subsequent to the ringing.