126 MR. G. A. BOULENGEB ON THE [MtIT. 6, 



. Of this very distinct species I have examined the type specimen, 

 a male, kindly couimunicated to nie by M. Bavay. It comes from 

 Kanala, Lifon. 



10. Rhacodactylus trachyrhynchus. (Plate XXI. figs. 2, 

 2 a, 2 6, 2 c, 2 d.) 



*Platydactylus dnvaucelii. Bavay, Cat. p. 6 (nee D. & B.). 



*Rh(icodactylus trachyrhynchus, Bocage, Jorn. Sc. Lisb. iv. p. 2(i3. 



* Chameleonurus trachycephalus, Bouleng. Bull. Soc. Zool. France, 

 1878, p. 68, pi. 2. 



*Platydactylus {Rhacodactylus) chahoua, Sauvage, Bull. Soc. 

 Philom. (7) iii p. 66 (nee Bavay). 



*Chamehonurus chahoua, Bouleng. Bull. Soc. Zool. France, 1879, 

 p. 142 ; Bocage, Journ. Sc. Lisb. 1881, p. 126 (uec Bavay). 



Head oviform ; snout longer than the distance between the orbit 

 and the ear-opening, once and two thirds the diameter of the orbit ; 

 ear-opening narrow, horizontal. Body and Hmbs moderately elongate, 

 rather depressed ; digits broadly dilated, not very unequal, with a 

 distinct rudiment of web, absent between the two outer toes. Sides 

 of neck with irregular folds. Snout and interorbital space with 

 very large, unequal, rough tubercles confluent with the cranial 

 ossification ; hinder part of head, body, and limbs with very small, 

 equal, granular scales, smallest on the throat. Rostral broad, quad- 

 rangular, with distinct median division above ; nostril pierced be- 

 tween the first labial and five or six small nasals, the anterior being 

 much the larges-t ; nine to eleven upper labials ; mental small, 

 triangular ; nine to eleven infralabials, gradually decreasing in size, 

 inner pair nearly three times as high as broad, in contact behind the 

 mental; a row of large scales behind the labials. Body and limbs 

 covered with very small granular scales. Tail cylindrical, with uni- 

 form small flat juxtaposed scales arranged in verticils. Male with 

 an irregular patch of very numerous pr^eanal pores. Head brown ; 

 the rest of the upper surfaces grey, dotted with darker ; lower sur- 

 faces dirty wliite, with scattered grey dots. 



millim. 



Total length 308 



Head 38 



Width of head 24 



Body 11.5 



Fore limb 50 



Hind limb 66 



Tail 155 



This description is taken from two specimens in the British Museum 

 and four others in the Brussels Museum. I have besides seen many 

 others, including the specimen determined by M. Bavay as Platy- 

 dactyhis duvaucelii, D. & B. (This lajt-uamed species, of which I 

 have examined one of the type specimens, belongs to a distinct 

 genus, Hoplodactylus, Fitz.) 



The synonymy of this Gecko has been lately rather confused. 



