THE FAMILIES AND GENERA OE BATS. 193 



verse ridge that extends across between pterygoids close to hamulars. 

 Audital bullae small, covering lessthan half surface of cochlese. Ex- 

 ternally as in Natalus except that the legs and tail are not elongated, 

 the sole and thumb are provided with conspicuous adhesive disks, and 

 the muzzle has a slight but evident wartlike elevation above the 

 nostrils. 



Species examined. — Thyroptera tricolor Spix and T. discifera 

 ( Lichtenstein and Peters). 



Family MYZOPODIDiE. 



1891. Vespertilionidce (part; Thyropterine division, part) Flower and 



Lydekker, Mammals, living and extinct, p. 665. 

 1898. YesperUlionidw (part, Myxopodem) Trouessart, Catalogus Mamma- 



lium, p. 134. 

 1904. Mygopodidw Thomas, Proc. Zool. Soc. London, II, p. 5, October 1, 1904. 



Geographic distribution. — Madagascar. 



Characters. 11 — Humerus with trochiter larger than trochin, the 

 relations of the two about as in the Thyropteridse, 6 surface of articu- 

 lation between trochiter and scapula well developed, about as in 

 Natalus or Rhinolophus, distal extremity of humerus essentially as 

 in Natalus] second manal digit with fully developed metacarpal 

 and " a short and very slender cartilaginous rod, probably represent- 

 ing the proximal phalanx " (Andersen), third finger with three bony 

 phalanges; shoulder girdle normal, the sternum showing no special 

 modifications; presternum small, much as in Thyroptera and with 

 similarly forward-projecting manubrium; mesosternum slender, flat, 

 slightly keeled; foot abnormal, the toes united to base of phalanges, 

 thence free but closely approximated, only two phalanges in each toe ; 

 fibula thread-like ° ; pelvis essentially normal, though with pectineal 

 process very short, a symphysis pubis in males, boundaries of sacral 

 vertebras distinct ; lumbar vertebrae not fused or in any way specially 

 modified; skull short, broad, and rounded, without postorbital pro- 

 cesses; premaxillaries fused, complete, isolating two lateral palatal 

 foramina ; teeth normal ; thumb and sole with sessile adhesive disks ; 

 ears separate, very large, tragus present but fused along its anterior 

 edge with ear conch, meatus partly closed by a conspicuous mush- 

 room-shaped process unlike anything known in other bats. 



History. — Until recognized as a distinct family by Thomas, this 

 group was regarded as a section of the Vespertilionidse. 



"Details concerning several important characters of this family which I 

 neglected to note when examining the skeleton in the British Museum, have 

 been kindly furnished by Mr. Knud Andersen. 



& " Tuberculum majus slightly more projecting than in Rhinolophus, but de- 

 cidedly less so than in Pterygistes." (Andersen.) 



" " I can not make out with certainty whether the extreme distal end of the 

 tibia perhaps shows some trace of ossification." (Andersen.) 



25733— No. 57—07 m — -13 



