Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 12. 1985. (Budapest, 1985)

(N=31). Lower M 1 antero-posterior length in Püspökfiirdo 2.23 mm, in Nagyharsányhegy 2.15 mm, in Csarnóta 2 locality 2.13-2.18 mm (N=3), in Tarkő 2.00-2.10 mm (N=2), in recent E

.serotinus 1.90-2.08 mm (N=31). Trigonid width of M 1 in Püspökfürdő 1.40 mm, in Nagyharsányhegy 1.45 mm, in Csarnóta 2 1.36-1.59 mm (N=3), In Tarkő 1.36-1.38 mm (N=2), in recent 1.31-1.50 mm (N=31). Talonid width of M 1 in Püspökfürdő 1.59 mm, in Nagyharsányhegy 1,59 mm, in Csarnóta 1.50-1.63 mm (N=3), in Tarkő 1.50 mm (N=2), in recent E. serotinus 1.40-1.68 mm (N=31). Comparisons and remarks. In lower dentition the available recent teeth are characterized by a wide range of measurements which include the measurements of almost all of those in fossil specimens (see Fig. 3). However, the antero-posterior length of lower P 4 in Püspökfiirdo and that of lower M 1 in Püspökfürdő, Nagyharsányhegy and Csarnóta 2 locality individuals are larger than the greatest recent ones. As regards the trigonid width of M 1, there are two greater ones in the Csarnóta 2 population. The measurements of the lower teeth from Beremend 15 fall among those of the recent E. serotinus. In the upper dentition, basal cross-sectional length of C in the Beremend 15 specimen is absolutely greater than In any of the recent animals and fits well into the range found in Csarnóta 2 where, however, the majority of the specimens is smaller (seer Fig. 3 E). So two size categories - one smaller, equal to the recent animals and one larger than the recent C-could occur. In cross-sectional width of upper C the Beremend specimen falls between the measurements of the few largest recent serotinus. The largest recent bat and some of the largest specimens from Csarnóta 2 are equal in C cross-sectional width. In upper M 1 anteroposterior length the Beremend 15 specimen is at the middle of the range of absolute values of measurements of recent, and only one of the Csarnóta animals (of 10) is bigger than the largest recent one. This is also true for the upper M 2 antero-posterior length, with the remark that the measurement of the Beremend 15 specimen is still relatively smaller. All in all - keeping in mind that our present pieces and also the ones from Csarnóta are single teeth and probably from various individuals - one may infer two possible explanations from the material. On the one hand, possibly there might have been two size categories of serotines in the Early Pleistocene (see C cross-sectional length and upper M 1 antero-posterior length). Regarding however the wide ranges of measurements of recent E. serotinus and the scarcity of fossil material, this is hardly probable. On the other hand, extreme variations of larger upper canines and large upper M 1 and lower M 1 and relatively smaller upper M 2 also might have occurred in the Early Pleistocene serotine bat.Before a final decision is reached, certainly a richer material and a detailed study are needed on the Pleistocene serotine. REFERENCES HELLER, F. (1936): Eine oberpliozäne Wirbeltierfauna aus Rheinhessen.- Neues Jb.Miner.Geol. Paläont. Beil. Bd., 76 (B): 99-160. JÁNOSSY, D. (1962): Vorläufige Mitteilung über die Mittelpleistozäne Vertebratenfauna der Tarkőfelsnische (NO-Ungarn, BUkk-Gebirge). - Annls hist.-nat. Mus. natn. hung., 54: 155-176. KORMOS, Th. (1930): Diagnosen neuer Säugetiere aus der Oberpliozänen Fauna des Somlyóberges bei Püspökfürdő. - Annls hist.-nat. Mus. natn. hung,, 27: 237-246. KRETZOI, M. (1956): Die altpleistozänen Wirbeltierfaunen des Villányer Gebirges. - Geol. Hung., Ser. Palaeont., 27: 1-264. KRETZOI, M. (1962): Fauna und Faunenhorizont von Csarnóta. - Magy. ÁH. Földt. Int. Évi Jel. 1959: 297-395. TOP ÁL, Gy. (1979): Fossil bats of the Rhinolophus ferrumequlnum Group in Hungary (Mammalia: Chiroptera). - Fragm. Min. et Pal., 9: 61-101. TOPÁL, Gy. (1983): New and rare fossil Mouse-eared Bats from the Middle Pliocene of Hungary (Mammalia, Chiroptera). - Fragm. Min et Pal., 11: 43-54. VAN VALEN, L. (1966): Deltatheridia, a new order of Mammals. - Bull. Am. Mus. nat. Hist., 132

: 1-126. Author' s address: Dr. György TOPÄL Zoological Department Hungarian Natural History Museum H-1088 Budapest Baross u. 13. HUNGARY