106 RANADE. 
rature, the presence or absence of light, and the influence 
of fear, and perhaps of other causes of mental excitement, 
although certainly much less striking and considerable, are 
scarcely less varied than those exhibited by the chameleon. 
The causes of these changes have not, I believe, been ex- 
amined, but the subject well deserves a careful and minute 
investigation. 
The whole of the family to which this species belongs are 
liable to great variety of colour, and even of marking ; but 
there are certain limits beyond which these variations do 
not extend, which although not always easily expressed in 
the few words which are convenient for a specific diagnostic 
phrase, are yet easily recognised by the eye, when once well 
and sufficiently observed. 
It is generally brown, inclining more or less to yellowish 
or reddish brown on the upper side, spotted irregularly with 
black, brown, or brownish grey, with transverse fasciee, 
which vary in number, of the same colour on the legs ;_ be- 
neath, yellowish white, sometimes with spots similar to 
those on the back, but smaller and fewer. ‘‘ The most con- 
stant mark,” as Mr. Jenyns well observes, “is an elongated 
patch of brown, or brownish black, behind the eyes, on 
each side of the occiput: there is also generally more or 
less indication of a whitish line running longitudinally 
down each side of the back, and enclosing a space paler 
than the adjoining regions.” 
Inch. Lines. 
Total length of the head and body : 2 8 
Length of the head : : SU 8 
5 hinder leg : : 5 4 0 
~ fore leg 1 5 
It has been long observed by several naturalists that a 
Frog exists in Scotland, of a much larger size than the 
