258 



DR. KNUD ANDERSEN ON BATS. 



[Apr. 7, 



between dark-coloured and light-coloured specimens : — Of 59 

 ful y adult examples (skins) of the northern races, 53 have the 

 supraorbital stripes pei'fectly wanting or but very faintly indi- 

 cated ; in 4 they are distinct, in 2 strong ; compare with this 

 the soiithern races : of 53 fully adult examples (skins) 3 have 

 these stripes faint (or quite undeveloped), 1 distinct, and no less 

 than 49 strong or very strong. In all individuals of the northern 

 races the infraorbital stripes are quite wanting or, at most, very 

 faintly indicated ; in more than half the number of skins of the 

 southern races (32 of 53) they are also faint or undeveloped, but 

 in 15 they are distinct, and in 6 strong. — That strong facial 

 stripes are much more fi'equently associated with light than with 

 dark colour of the fur is proved by the following statistics : — 

 Of the dark-coloured individuals of the northern races scarcely 

 5 p. ct., of the light-coloured individuals of the same races about 

 25 p. ct., have the supraorbital stripes well developed ; of the 

 dark-coloured individuals of the southern races 75 p. ct., of the 

 light-coloured individuals 100 p. ct., have the supraorbital stripes 

 well developed. — More extensive material than I have been able 

 to bring together may, of course, alter these figures somewhat, 

 in one or other direction, but it is not likely that it will alter 

 the general conclusion to any essential degree. — The subjoined 

 table gives the details (compare diagram p. 259). 



From the two facts, viz. (1) that the facial stripes are less 

 developed in immatures than in adults, less developed in the dark 



Faded stripes. 



