NEW TRBB-KIKjf; FliOM TltlVIUAO. 1083 



IiiterorbitMl rogion a little broa/Jer tlian tlie upper oyelid. 

 'J'yrnpanum fairly distinct, -J diurnoter of f^yf;, Fingers mtlicr 

 short, with small discs, outer ^ webbed. Hubarticular tubfireles 

 feeble. No projecting rudiment of pollex. Toes 4 webbed. 

 The hind limb };eing carried forward along the body, tbe tibio- 

 tarsal articulation reaches between the eye and the end of the 

 snout. Tibia half the length of the liead and body. Upper parts 

 smooth, with minute granular war-ts on the head and the anterior 

 part of the back. Male with a feebly developed subgular vocal 

 sac, forming loose folds. 



(Joloralio'ih, — The rapid changes in colour wljicli this frog 

 undergoes are probably unparalleled in any other J>atrachian. 

 The same individual may vary dorsally from dark brown, reddish 

 Vjrown, various shades of yellow, to a very pale greyish wln'te. 

 When star-tied the majority Vjecaine of a bi-igbt lernon-yellow. 

 In one specimen I oVjserved the head, fore limtjs, and anterior 

 part, of tlie body to be dai-k brown, whilst tlie posterior par-t of 

 the body and hind limbs were greyish white. In another speci- 

 men the right half of the body was brown, the left half greyish 

 white. A brown or grey marking, often hourglass-shaped, 

 edged with darker or lighter, extending from between the eyes to 

 the anterior third of the back, followed by one or two transverse 

 bars, is frequently present, appearing and disappearing with 

 great rapidity. In one specimen the marking took the shape of 

 a cross-bar between the eyes and two parallel longitudinal ba,nds 

 extending along each side of the entire length of the back. 

 Faint cross-bars on the hind limbs are occasionally present. 

 Lower parts white or yellow. Iris golden, much obscured by 

 brown pigment ; a clear golden line borders the pupil, wliicli 

 when fully contracted becomes perfectly linear. 



The largest specimen measures 22 mm. from snout to vent. 



This little Tree-Frog is extremely agile in its movements, 

 making leaps of quite six feet. In the daytime it usualiy kept 

 quiet, sticking to the leaves in the terrarium. On anival the 

 males issued a sharp creaky note, but became perfectly mute 

 after a day or two at the Gardens. 



This species appears to be more nearly relatefl to Ilyla strv/data 

 Spix, from Brazil, and Ilyla mwera AVerner (Zool. Anz. 1903, 

 p. 252), from Caracas, Yenezuela, than to any others. It differs 

 from both in the shorter snout ; from the former also in having 

 more fully webbed toes ; from the latter in having a smaller 

 tympanum, and a shorter web between the fingers. 



EXPLANATION OF PLATE LXIV. 

 Gongh's Tree-Frog (Hyla goughi). 



