1908.] 



DR. KNUD ANDERSEN ON BATS. 



287 



closer examination shows that not all parts of the digits have 

 been lengthened in glmicios and ivatsoni ; the metacai-pals are 

 practically quite as in jjlconirostris and jamaicensis (the fifth 

 metacarpal very slightly lengthened), but the first and second 

 phalanx of the third digit, and the first phalanx of the fourth 

 and fifth digits are noticeably longer. The wing-indices on p. 310, 

 and the diagram below show the details. One fact resulting from 

 this modification is worth noticing : both the first and the second 

 phalanx of the third digit are lengthened, but the former con- 

 sidei'ably more than the latter (lengthening of first phalanx 57, 

 of second only 27 mm., for an assumed length of forearm of 

 1000 mm.). The result is that, whereas in the planirostris and 

 jamaicensis type the second phalanx of the third digit is very 

 distinctly more than 1^ the length of the first, it is in glaucus 

 and -watsoni always less than 1| of the first, a peculiarity easily 

 ascertained on careful examination of the wings of these bats. 



plamrostris d'' 



fflaucus, U}atsoni d'^ 



planirostris 'P 



fflaucus, ivatsoiii S-* 



planirostris d" \ — 



fflaucus, loatsoni 5^ - ___ - ' — -- - ■ — ' 



/, forearm. Givea this length of the forearm, the third, fourth, and fifth digits 

 have in A. planirostris the lengths indicated by the lines d-\ d-*, and d'>, in 

 A. fflaucus and ivatsoni the lengths indicated by the lines S-\ iS-t, and S^. The 

 subdivisions of d'' and S^, in direction from left to right, indicate the meta- 

 carpal, first, second, and third phalanx; those of d*, S-*, and d^, 55 the meta- 

 carpal, first and second phalanx. 



Hairing on limbs and membranes. — Above, the proximal two 

 thirds of the forearm densely haired; a tuft of hairs on the 

 metacarpal of the pollex ; the interfemoral, femur, tibia, and foot 

 to the claws, covered with very short spai'se hairs. Below, the 

 interfemoral hairy along the middle, almost naked laterally. 



Colour. — The fur of the only specimen on record, a young 

 adult female (full-grown, but epiphyses of metacarpals separate) 

 preserved in alcohol, has the following colour : — Upper side greyish 

 drab with a slight tinge of fawn, base of hairs lighter, washed with 

 ecru-drab. Under side light greyish drab. White supraorbital 

 and infraorbital stripes distinct. Apparently no white mai-gins 

 to the ears. 



Proc. Zool. Soc— 1908, No. XTX. 19 



