C «AP. XII. 
AMriilBIANS. 
27 
f hese animals, however, offer one interesting sexual 
merenee, namely in the musical powers possessed by 
males ; hut to speak of music, when applied to the 
' Mordant and overwhelming sounds emitted by male 
JU H-frogs and some other species, seems, according to 
° Ur taste, a singularly inappropriate expression. Never- 
theless certain frogs sing in a decidedly pleasing man- 
aer - Near llio de Janeiro I used often to sit in the 
ev ’ening to listen to a number of little Hylrn, which, 
32. Megalophrys montana. The two left-hand figures, the male ; the two 
right-hand figures, the female. 
j? Pl(, hed on blades of grass close to the water, sent 
U1 th sweet chirping notes in harmony. The various 
l° UQ( is are emitted chiefly by the males during the 
/’^'ding-season, as in the case of the croaking of our 
c ‘°ttmion frog . 42 In accordance with this fact the vocal 
lagans of the males are more highly developed than 
° Se of the females. In some genera the males alone 
42 Belt, 1 History of British. Beptiles,’ 184!), p. 93. 
