ADDENDA. 471 
Page 120. Add a species :— 
la. Rappia betsileo. 
Eucnemis betsileo, Grandid. Ann. Sc. Nat. (5) xv. 1872, art. 20, p. 10. 
Head very small; snout rounded, as long as the orbital diameter ; 
_ tympanum hidden. Fingers half webbed ; toes three-fourths webbed. 
The hind limb being carried forwards along the body, the tibio- 
tarsal articulation reaches the eye or a little beyond. Skin smooth, 
granulate on the belly and under the thighs ; no strong fold across 
the chest. Greenish or blackish aboye; a bright yellow, beneath 
black-edged, band from the tip of the snout through the eye along 
each side of the body; thighs, hands, and feet bright yellow. 
Closely allied to R. horstockii, but differing in the smaller head. 
Specimen e of the latter species should be referred to R. betsileo. 
Madagascar. 
GO. S.E. Betsileo. 
b-d, e-f. @. East Betsileo. Rey. Deans Cowan [C.]. 
i) 
Page 129. Megalixalus madagascariensis. 
Add :— 
s-t. 2. East Betsileo. Rey. Deans Cowan [C.]. 
Sides of head and hody, fore limbs, thighs above and beneath, and 
feet bright yellow. Doubtless the Hucnemis antanosi of Grandidier. 
Page 137. Hylambates microtympanum 
is to be referred to the genus Rhacophorus. 
Page 142. Add a new species :— 
4, Mantella cowanii. 
Snout subtriangular, a little longer than the diameter of the eye ; 
canthus rostralis distinct ; loreal region vertical; interorbital space 
broader than the upper eyelid; tympanum distinct, two fifths the 
diameter of the eye. Fingers and toes moderate, the tips dilated 
into very small disks ; subarticular tubercles distinct ; a small inner 
metatarsal tubercle. The hind limb being carried forwards along 
the body, the tarso-metatarsal articulation reaches the eye, or a 
little beyond. Skin smooth, except on the flanks and the lower 
surface of the thighs, which are granulate; a slight fold from the 
eye to the shoulder. Black; a large spot at the base of the limbs, 
extending on the humerus and femur, and round spots on the throat, 
belly, and lower surface of femora yellow; a broad band encircling 
