new Genus and Spectes of Frogs, 327 
with dark brown; limbs with large dark brown transverse 
spots; lower surfaces white, the throat with dark vermicula- 
tions. Iris golden. From snout to vent 59 millim. 
This most remarkable form approaches TZriprion in the 
shape of the head; the large compressed metatarsal tubercle 
distinguishes it from any species of the family Hylide. 
_ It is a timid creature, getting very frightened when handled, 
whilst all other Hylide I have seen alive are very indifferent 
under similar circumstances. It is slow in its movements, 
and not a good climber. Its habits are more burrowing than 
arboreal. It is not able to climb up a glass, but burrows 
itself deeply in the moss by means of its metatarsal shovels, 
the movements executed-in this proceeding being exactly those 
of Pelobates. I believe this to be the first mstance of an 
adaptation to both burrowing and arboreal life. Some species 
of Callula, which were formerly believed to present this com- 
bination, are truly burrowing and unable to climb to any 
extent; Callula pulchra, which I had the pleasure of seeing 
alive inthe Jardin des Plantes a few months ago, lives ex- 
actly like Pelobates, to which it bears a strong resemblance in 
the shining skin and enormously inflated lungs. 
Hyla venulosa (Laur.). 
This species has not been hitherto recorded from Mexico. 
The coloration of my specimen is as follows :—Upper surfaces 
light brown, with large chestnut-brown spots ; these occupy 
entirely the hinder part of the back and the hind limbs; upon 
the latter the lighter ground-colour appears in the form of 
transverse lines; on the flanks the spots are bordered with 
pure white ; lower surfaces of a rather dirty white, the throat 
with brown vermiculations. The eye is very beautiful, the 
iris being golden with black reticulations, and a vertical and 
a horizontal black bar, forming a cross. The vocal bladders 
are black ; they cannot be retracted, as in the Rane with 
external vocal sacs; and when empty they hang on each 
shoulder like a cutaneous lobe. As is well known, the bones 
of this frog are of a beautiful “ vert de gris ;” this colour is 
seen on the vomerine groups and on the border of the lower 
jaw when the mouth is open. 
The attitudes and movements of H. venulosa are much the 
same as those of its European congener; but it is entirely 
nocturnal, remaining concealed the whole of the day. It is 
by no means shy, but, when handled, exudes a great quantity 
of poisonous fluid, more so than any Batrachian I have had 
before. Besides, this fluid, of a milky appearance, coagulates 
