434, THE VIVARIUM, 
mealworms, and other small creatures which then can be 
procured. 
These Frogs used to cost as much as 5s. each at Covent Garden 
Market, and now they can be bought there, I believe, at any 
season of the year at about 9d., or even 6d. each. 
Of H. arborea, the tongue is almost circular, slightly nicked, 
and free behind; the snout is rounded, and the head is broader 
than long; the tympanum is distinct, and about half the size of 
the eye; the fingers are webbed at their base, and the toes for 
about two-thirds of their length; the disks are smaller than the 
tympanum; there is an ankle fold. The skin of this Frog is 
smooth above and granulated below. Asa rule, the upper parts 
of the body are green, and the lower parts a uniform white. 
The male may be known from the female by a large brown 
subzular vocal sac. This Batrachian is about 14in. long. It is 
a native of Europe, the temperate parts of Asia, and of North 
Africa. There are, owing to a difference of markings, which 
chiefly take the form of darkish streaks and bands, four or five 
varieties of this Frog. 
The Leaf-green Tree-Frog (Hyla phyllochroa) is a very beauti- 
ful Batrachian, and a native of Eastern Australia. It is a 
smaller animal than ZH. arborea, but it has very similar habits. 
This Frog, lately introduced into England in some considerable 
numbers, has been sold here for so low a sum as 5s. It becomes 
very lively towards the evening, but during the daytime it is 
yenerally quite ready to leave its retreat on the leaf of a plant, 
or under a piece of cork, when some insect is placed in its 
Vivarium. 
This Frog has an almost cireular tongue, slightly nicked, and 
free behind; ashort, broad head; the vomerine teeth placed in 
two small groups behind the level of the inner nostrils; a tym- 
panum much smaller than the eye; fingers webbed at their base, 
and toes webbed for three-quarters of their length; there is a 
fold on the ankle and another on the chest. The upper parts of 
the body are smooth and the lower granulate. The colour above 
is a uniform green and below a uniform white. A very narrow 
black line runs from the eye, above the tympanum, and dis- 
appears at a short distance from the shoulder. 
