170 
HORN EXPEDITION—AMPHIBIA. 
Total length of body and tail, 60 mm.; body, 27 mm.; tail, 33 mm.; width of 
body, 16 mm.; height of tail, 18 mm.; spiraculum from end of snout, 16 mm.; 
spiraculum from centre of eye, 9 mm.; nose to end of snout, 5 mm.; nose from 
centre of eye, 5 mm. 
(5) Hyla mbella, Giinther. (Plate XV., Figs. 26, 27, 28). 
Adult.—Amongiit the numerous specimens collected from various localities 
there is considerable variation in form and colouration. 
In most specimens the head is scarcely as long as broad. 
The vomerine teeth are arranged in two straight or slightly-curved rows 
immediately behind tlie choanre, the distance between them varying somewhat. 
The tympanum varies in size from one-half to two-thirds the diameter of the 
eye. It also varies in distinctness considerably. 
The discs vary within considerable limits. In some specimens those on the 
hands and feet are of equal size, though, in the majority, those on the hand are 
larger than those on the feet. In tlie largex’-sized specimens (measuiing 33 mm. 
from snout to vent) fi’om Palm Creek, the discs of the hand are as large as the 
tympanum, but in the majority they are smaller, though their I’elative size in 
regard to the tympanum varies. 
As stated in the British Museum Catalogue, when the extreme forms are 
placed together the difference is a striking one, but in a good-sized collection all 
intermediate forms occur. 
The colouration varies very much indeed. A very common form is as follows : 
dorsal surface greyish with a tinge of rusty-brown shading off towards the sides of 
the body. A dark band commencing at the snout runs back above the tympanum 
and half-way along the body. Fore and hind legs a dirty white, or light grey on 
their upper surfaces, splotched with darker grey markings. The anterior and 
posterior faces of the thigh yellow, as is also the side of the body in contact 
with the thigh when the latter lies against the body. 
In others the upper surface may be a dull brownish grey with faint indica¬ 
tions of dirty white splotches, and dark purple grey lines running roughly, longitu¬ 
dinally, and not infrequently dark splotches run along the sides of the body. 
At one spot—a water-hole on the Adminga Creek—the colouration was 
distinct, and differed somewhat from that of specimens met with elsewhere, 
