Variability of wing shape of the genus Plecotus in Central Europe was studied in 159 individuals of P. auritus (n = 109) and of P. austriacus (n = 50). Measurements of all metacarpals and phalanges of digit III, IV and V as well as measurements of forearm were taken from live animals (n = 102) and from museum dry specimens (n = 57). Interspecific differences of the relative length of the first phalanges of digits III, IV and V to the total length of corresponding digits were observed. A difference in relative wing tip length to the forearm length (wing tip index) was also found. In P. austriacus the wing tip is significantly longer than in P. auritus. However the first phalanx of digit III in P. austriacus is significantly shorter. An adaptive importance of this morphometric difference is discussed.