466 MAMMALIA. 



Genus 28. — Thyroptera. — Spix. 



Generic Character. — Dentition, unknown ; body slender, 

 small J nose simple ; wings very narrow, running down to the 

 tarsus ; thumb of the hand armed below with a somewhat con- 

 cave patella ; interfemoral membrane expanded, not extending 

 beyond the feet ; tail long, exserted beyond the membrane. 



Thyroptera tricolor. — The Three- Coloured Thyroptera. 

 — Fur of the body above fuscous brown, pure white beneath ; 

 wings and legs deep black. Inhabits Brazil, frequenting the 

 shores of the river Amazon — Spix, Sim. Braz. t. 36, f. 69. 



Genus 29. — Proboscidea. — Spix. 



Generic Character. — Incisors *, canines J^l}' molars ^j; 

 total 34. Upper incisive teeth very small, distant, and diverg- 

 ing J the lower lobed, and placed in a semicircle ; the front 

 molars small, the rest with many tubercles ; wings narrow ; tail 

 long, half involved in the interfemoral membrane. 



Proboscidea saxalilis. — The Rock Proboscidea.— Fur ot 

 the upper parts of the body variegated with gray and brown , 

 ash-coloured, inclining to mouse-colour, beneath ; wings and 

 feet fuscous-brown. Inhabits Brazil, frequenting rocky places 

 on the shores of St Francis — Spix, Sim. Braz. t. 35, f. 8. 



Genus 30 Vespertilio. — Linnaeus. 



Generic Character. — Incisory teeth *, canines }-j', molars 

 sZsi %zli Izi or |-^ ; from 32 to 36. The upper incisors are 

 separated in pairs, cylindrical and pointed, very close, with two 

 cutting lobes directed forward ; the anterior molars conical, the 

 posterior having several sharp points or prominences ; the nose 

 simple, without any membranaceous appendage, ridge, or fur- 

 row; ears lateral and distinct, internal ears visible; tongue 

 smooth, not protractile; index finger with but one phalanx, the 

 middle with three, the annular and little finger with two ; tail 

 not exceeding the interfemoral membrane. Sebaceous glands 

 uiider the skin of the face, assuming different forms and dimen- 

 sions in the various species. 



Vespertilio murinus. — The Common Bat — Plate V. fig. 13. 

 — See description, vol. II. p. 369. 



Genus 31 — Plecotus. — Geoffroy. 

 Generic Character. — Incisors |, canines J~J, grinders ^^ or 



S— 5, 

 6-6> 



