VI INTRODUCTION. 



A summary of the principal facts of the geographical distribution 

 of Batrachians generally is appended to this volume. 



The author begs to express his thanks to the following gentlemen 

 who have kindly placed at his disposal specimens from the collections 

 under their charge : — Professor Vaillant (Museum d'Histoire natu- 

 relle, Paris), M. Dupont(Musee Boy ale d'Histoire naturelle, Brussels), 

 Dr. Boettger (of the Senckenberg Museum), Professor Schneider 

 (Zoologisches Museum, Breslau). M. Lataste, of Paris, has again 

 given him free access to his important private collection. 



As far as possible, the colour is described from life. The measure- 

 ments are given from the largest specimen in the collection. 



As in the preceding volume, the affixes to the names of donors 

 &c. may be explained as follows : — " [P.] " signifies " Presented 

 by"; «[C.]"=" Collected by"; «[E.]"=" Obtained by exchange." 



G. A. BOULENGER. 



British Museum, 

 Nov. 25, 1882. 



