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Show 558 M« G. A. BOULENGER ON THE [NOV. 16, Dimensions. From snout to vent Length of head Breadth of head From eye to nostril From eye to tip of snout Greatest diameter of orbit Interorbital space Horizontal diameter of tympanum. Vertical diameter of tympanum.... Length of parotoid Breadth of parotoid Body Fore limb Hind limb Tibia a. m. 0*112 0030 0040 0-008 0013 0-012 0010 0*004 0-0055 0024 0013 0-082 0-082 0-155 0046 b. m. 0*122 0033 0045 0-008 0014 00125 0-012 0-0055 0-0065 0026 0015 0089 0-079 0163 0050 m. 0041 0012 0016 0003 0-0055 0*005 0004 0002 00025 0008 00045 0029 0023 0048 0-016 a. b. c. 3> Loc? Brussels Museum. 2 • Loc. ? Brussels Museum. Young. Loc. ? Brussels Museum. Description.-This species has generally been confounded with the following one, from which it differs chiefly in its physiognomy, its small tympanum, its very concave fronto-parietal bones, and its two-rowed subarticular tubercles under the fingers and toes. The head resembles that of B. viridis ; but the interorbital space is very concave in adult specimens, and broad, its breadth being always more than the greatest breadth of the upper eyelid. The nostrils are rather nearer the tip of the snout than to the anterior corners of the eyes; the space between them equals that between one of them and the lip. The eyes are equally distant from the tip of the snout and from the angles of the jaws. The tympanum is very distinct, subovate ; its greatest diameter, the vertical, is somewhat more than half the horizontal diameter of the orbit. The cleft of the mouth extends to the level of the centre of the tympanum. The tongue is generally broader than in the preceding species, its breadth equalling about two thirds of its length in males, three fourths in females. The parotoids are rather large, depressed, elliptic, their inner edges slightly divergent backwards, their front edges nearly in contact with the upper eyelids ; their length equals nearly the double of their breadth, or the distance between their anterior edge and the tip of the snout. The body is rather more than twice and a half as long as the head, with slight difference between the sexes ; it is shorter in young. The fore limb is very stout and as long as the body in males, thinner and much shorter in females. The fingers are moderately elongate, truncated or even slightly swollen at the tips, especially in |