1900.] BATRACHIANS AND REPTILES OE THE GABOON. 439 



sternum and sternum with a bony style. Terminal phalanges 

 simple, obtuse. 



This genus may be defined as Bana with a vertical pupil. 



16. Scotobleps gabonicus, sp. n. (Plate XXVIII. fig. 1.) 



Vomerine teeth in two small groups on a line with the posterior 

 borders of the choanae. Head rather large, as long as broad ; 

 snout obtusely pointed, with feeble canthus rostralis ; loreal 

 region slightly concave ; nostril equally distant from the eye and 

 the end of the snout ; eye large ; interorbital space narrower than 

 the upper eyelid ; tympanum not quite half the diameter of the 

 eye. Fingers and toes' moderately elongate, with slightly swollen 

 tips and very strong subarticular tubercles ; first finger extending 

 as far as second ; toes half -webbed ; an oval inner metatarsal 

 tubercle. The tibio-tarsal articulation reaches the nostril. Skin 

 smooth, or with small flat warts on the back. Olive-brown above, 

 with small blackish spots ; a dark cross-band between the eyes ; 

 upper lip with blackish vertical bars, the one below the anterior 

 third of the eye extending on the lower lip ; limbs with dark cross- 

 bars ; lower parts white. Male with internal vocal sacs. 



From snout to vent 57 millim. 



Three specimens from the Benito River ((?. L. Bates). 



17. Petropedetes newtoni Bocage. 



Tympanoceros newtonii, Bocage, Jorn. Sc. Lisb. (2) iii. 1 895, p. 270, 

 and iv. 1895, p. 18, pi. — . 



Males differ from females in the larger tympanum, which is 

 larger than the eye, and from the centre of which a horn-like 

 dermal tubercle projects, in the presence of a long spine on the 

 inner side of the first finger, and in the greater size of a large flat 

 oval gland on the lower side of the thigh. 



Several specimens were obtained on the Benito River by 

 Mr. Bates. The specimens described by Barboza du Bocage are 

 from Fernando Po. 



The genus Petropedetes Beichenow (Arch. f. "Nat. 1874, p. 290) 

 is nearly related to Gornufer, but differs in the division of the der- 

 mal pad on the upper surface of the digital expansions by a short 

 distal groove, giving it a cordiform appearance. The males are 

 remarkable for the large glands under the thighs, which are absent 

 or feebly developed in the females. In addition to the type species 

 and the one now referred to, the genus embraces Gornufer johnstoni 

 Boulenger, from the Rio del Bey, Camaroons. The three species 

 may be distinguished as follows : — 



P. eameronensis Reich. Toes half-webbed ; tympanum half 

 diameter of eye. 



P. johnstoni, Blgr. Toes with a mere rudiment of web ; tym- 

 panum half diameter of eye. 



P. newtoni Bocage. Toes with a mere rudiment of web ; tym- 

 panum more than half diameter of eye ; male with a spine on the 

 inner finger and a dermal tubercle on the tympanum. 



