1908. 



DR. KNUD ANDERSEN ON BATS. 



Dark and light coloured individuals. 



257 



The anomaly is worth noticing, because it recalls the white 

 dorsal stripe characteristic of many species of the more primitive 

 genus Vam2J2/ro2)s (and of Uroderma). 



A few individuals show some slight trace of a narrow white 

 margin to the ears, a feature of common occurrence in those 

 species of Ai-tiheus which possess | molars. 



Facial stripes. — Many individuals have two pairs of whitish 

 or yellowish-white, longitudinal stripes on the head, viz. a pair 

 of supraorbital stripes from the base of the lancet, passing above 

 the eye, to a point above the inner side of the ears ; and a pair 

 of infraorbital stripes from the angle of the mouth to the outer 

 base of the ears. 



There is every stage of transition, from complete absence to 

 very strong development, of these facial stripes. A certain corre- 

 lation exists between the development of the supraorbital and 

 infraorbital stripes ; very strong supraorbital stripes are almost 

 always associated with well-marked infraorbital stripes, faint 

 supraorbital stripes with completely wanting or indistinct infra- 

 orbital stripes. The infi'aorbital stripes are, almost invariably, 

 markedly fainter (narrower, or more indistinct) than the supra- 

 orbital stripes. 



Immature individuals have the facial stripes less well marked 

 than adult or aged examples. As to fully adult and aged indi- 

 viduals, there is a dilierence in the development of the facial 

 stripes between the northern and southern races, and a difference 



17* 



