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Show 1881.] AND FROGS FROM SINGAPORE. 225 the limbs inconspicuous. The length of the manus from the wrist to the tip of the longest finger is nearly equal to the width of the head. Vomerine teeth in two straight ridges, nearly in the same right line ; the distance of the two series apart is scarcely more than half the length of each series ; the ridges commence from the anterior inner margins of the inner nostrils. inches. Length of head and body 4 "5 ,, hind limb from anus to end of longest toe 6*75 ,, foot 2 „ hand 145 This species much resembles the East-Himalayan and Assamese R. maximus, which it equals or excels in size ; but the tympanum is proportionally twice as large, and the webs of the feet are less developed (they are shorter in the fore feet of R. maximus than in those of R. reinwardti or R. malabaricus). From R. reinwardti the new form is distinguished by size, coloration, and by the fingers being imperfectly webbed. The single specimen sent, Dr. Dennys informs me, was of a beautiful emerald-green colour when alive, and belonged to a well-known Chinese merchant named Whampoa, who refused an offer of five hundred dollars for it. When the animal died, it was presented to the Raffles Museum. It is said to have originally come from China ; but the precise locality is not known. In the smaller forms of Rhacophorus, the development of the folds of skin along the sides of the limbs and above the anus is very remarkable. Mr. Wood-Mason called m y attention to this in the case of R. maculatus (and I find the same in R. reinwardti), and noticed that this form shows a passage towards the curious Flying Frog of Borneo figured by Wallace in the ' Malay Archipelago,' vol. i. p. 60. RANA MACRODON. (Plate XXI. fig. 4.) I am indebted to M. Boulenger for the identification of this species. The specimens differ considerably from the descriptions given by Dumeril and Bibron1, and by Giinther3, both of whom describe the tympanum as small. This character, however, is, I learn from M. Boulenger, more variable than has hitherto been supposed; and as there is, in the British Museum, a specimen from Java, the original locality of the species, that agrees with those from Singapore, I accept M . Boulenger's opinion. The following is a description of the Singapore specimens. Head very broad and flat-the breadth across the gape being greater than the distance from gape to muzzle, and equal to the length of the hind foot in females, exceeding it by one eighth to one tenth in males. Snout depressed, rounded at the end ; no trace of canthus rostralis; the nostrils near the end of the snout and distant from the eye, their distance apart being about half of the in- 1 Erp. Gen. viii. p. 382. 2 Brit.-Mus. Cat. Batr, Sal. p. 8. PROC. ZOOL. Soc-1881, No. XV. 15 |