1908.] DR. KXUU ANDERSEN ON BATS. 291 



recognised in this paper, have been examined, in none of them is 

 mj, or any trace of its alveolus, present. — The heel of p* is a trifle 

 larger than in glaucus and loatsoni, but the difference is so small 

 as only to be ascertained on very close comparison of the teeth. 

 The small increase in the size of the heel of p* corresponds to the 

 small increase (on average) mentioned above in the size of the 

 " heel " (cusp 7) of m\ 



As in glaucus and ivatsoni there is only a very faint trace (or, 

 often, no indication at all) of a notch in the hinder margin of m^'', 

 between its cusps 5 and 7. 



Tragus. — 2, 3, or 4 serrations on the outer margin above the 

 median projection, always small, sometimes rather sharply defined, 

 sometimes so obsolete that their number cannot be counted with 

 certainty. 



Nose-leaves. — The margin of the horseshoe is free all round, 

 simple or finely crenulate. 



Wings. — The peculiarities in the wing-structure described above 

 in A. glaucus and toatsoni {]>. 287) are also found in their closest 

 relative A. cinereits ; as in the former species the second phalanx 

 of the third digit is not fully 1| the length of the first. The 

 only appreciable difference is a slight lengthening of the meta- 

 carpals and of the phalanges of the fourth and fifth digits ; by 

 this modification the wings have become on the whole slightly 

 longer and, because the increase falls chiefly on the fourth and 

 fifth digits, somewhat broader than in glaucics and toatsoni. 

 See the wing-indices, below p. 310. 



Hairing on limbs and membranes. — As in ^. gUiucus and toatsoni 

 (above p. 287). 



Colour. — There is no difference in colour between the two 

 geographical races of A. cineretcs. The only skin available of a 

 young (not full-grown) individual is very dark-coloured, almost 

 precisely as young individuals of A. jamaicensis. Some of the 

 adult specimens with unworn teeth come extremely near in colour 

 to this young one, while the majority are a shade lighter, being 

 cjuite indistinguishable in colour from A . toatsoni ; a few specimens 

 are washed with drab-brown on the upper side ; none are as light 

 as the light-coloured stage of A. toatsoni described above (p. 290). 

 Young, nearly full-grown (San Julian, Venezuela ; U.S. IST. M. 

 105432 ; A. c. bogotensis) : — IJpper side from the shoulders back- 

 ward dark smoky brown, almost blackish brown, this colour 

 confined to the tips of the hairs ; base of hairs slate. On the 

 anterior part of the upper side, from the shoulder region forward, 

 the hair-bases are considerably lighter, nearly smoke-grey. Under 

 side dark grey, approaching hair-brown. White supraorbital and 

 infraorbital stripes strong. Ear-conch narrowly margined with 

 white. ISTo light tips to the wings. 



A majority of adult individuals, teeth unworn or worn (both 

 races) : — Precisely as the darker stage of A. toatsoni (p. 289). 



Two adults (Kanuku Mts., Guiana ; and Merida, Venezuela ; 

 teeth unworn ; A. c. cinereus): — Upper side washed with drab- 



