no Journal of the F.M.S. Museums. [Vol. VII, 



Genus Nyctixalus, Boulenger. 



1882. Nyctixalus, Boulenger, Ann. Mag. Nat. Hist. (5) 

 X, P . 35- 



1912. Nyctixalus, Barbour, Mem. Mus. Zool. Harvard 

 XLIV (1), p. 70. 



The only form hitherto assigned to the genus is the 

 type-species N. margaritifer, Boulenger. It is recorded as 

 being from "the East Indies." Barbour examined a specimen 

 from Tjibodas and published a figure, which is certainly 

 incorrect, (op. cit., pi. viii. fig. 32). He noted certain 

 peculiarities, however, that also occur in Mr. Robinson's 

 specimens. The differences must, therefore, be specific and 

 I describe the Javanese form as a new species, under the 

 name 



Nyctixala's robinsoni, sp. nov. 



Head large, triangular; snout pointed, a little longer 

 than the orbit; nostril about half way between the eye and 

 the tip of the snout, rather prominent. Tongue deeply- 

 notched, without free papilla. No vocal sacs. Interorbital 

 space flat, broader than upper eyelid. Tympanum hidden, 

 very small. A strong fold from the upper eyelid to the 

 shoulder. Dorsal surface of head and body with scattered 

 rounded tubercles ; eyelid tubercular; ventral surface of head 

 and body coarsely tubercular. Hind limbs long; tibiotarsal 

 articulation reaching the anterior margin of the eye or the 

 tip of the snout. Subarticular tubercles poorly developed ; 

 an obscure inner metatarsal tubercle. Discs on fingers and 

 toes at least as large as the tympanum. Digits short : 

 first finger not extending as far as second: toes about 1/3 

 webbed ; no web on the fore feet. 



Length of head and body in type-specimen 20 mm. 



Dorsal surface dark grey or brown, obscurely mottled; 

 a silvery cross-bar sometimes present between the eyes. 

 Flanks mottled with black and white. Hind limbs with 

 irregular brown cross-bars. Ventral surface speckled with 

 grey or entirely infuscated. 



The species differs from A 7 , margaritifer in its small 

 hidden tympanum, in the position of the nostril and probably 

 in other points. The iris can apparently be closed completely 

 over the pupil, but Barbour's figure represents the opening 

 as very large and transversely oval, thus complete!) ignoring 

 the essential generic character, which is the vertical form 

 of the slit. Apart from this character and from its darkei 

 colouration the species closely resembles Ixalus aurifasciatus. 



Locality. Tjibodas, Java: alt. 4,700-6.500 feet (February, 

 1916). 



Type-specimen. No. 18,337 Rept., Zool. Survey India. 

 Cotypes in the Selangor Museum. 



