G. A. nOULEXGER 



with wliitisli; rarely a hroad whitish vertebral stripe, which may 

 be accompanied by a whitish line along the l^ack of the thighs 

 and the inner side of the legs; throat or tlu'oat and breast dark 

 l)rown or black, uniform or with round wliite spots; belly dirty 

 wliite , uniform or mottled with brown. Male with a subgular 

 vocal sac. 



The largest male measures 12 millim., the largest female lo. 



TÓ specimens fi'om Prince's Island, at altitudes of 100 to 300 m. 



27. Arthroleptis ogoensis, sp. n. (PI. I, tigs. 7-8). 



Tongue with a conical median papilla. Head moderate, as long 

 as broad; snout obtusely pointed, as long as the eye, with obtuse 

 canthus; nostril equally distant from the eye and from the end 

 of the snout; interorbital space broader than the upper eyelid; 

 tympanum hidden. Fingers moderate , first and second equal , 

 more than half as long as third, the tips feebly dilated; toes mo- 

 derate , nearly half webbed , the web extending as a fringe on 

 the sides to the tips , which are dilated into small but very di- 

 stinct disks; subarticular tubercles small l)ut very prominent; two 

 small but very prominent metatarsal tubercles, inner oval, outer 

 round; a small rounded tubercle on the inner side of the tarsus, 

 connected with the inner metatarsal tubercle by a narrow^ dermal 

 ridge; the distance between the two metatarsal tubercles is con- 

 siderably less than the distance between the inner and the tarsal 

 tubercle. The tibio-tarsal articulation reaches the eye. Skin smooth 

 or with small warts above; a fold from the eye to the shoul- 

 der. Brown above, with indistinct darker marblings on the back 

 and cross-bands on the limbs; sometimes a light vertebral streak; 

 lips with large dark brown spots; hinder side of thighs with a 

 more or less distinct white, black-edged stripe; lower parts white, 

 throat sometimes spotted with brown in the female, dark brown 

 in the male. ^lale with a subgular vocal sac. 



From snout to vent 20 millim. 



Five specimens from Lambarene, Ogowe. 



I have recently revised the large material of this genus of 

 frogs at my disposal , and after various synonpnic identifications 

 and eliminations to which I have recently alluded in the Annals & 

 Magazine of Natural History (XYH, 1906, p. 320), I find that as 

 many as 18 species of Arihì^oleptis are capable of definition. 

 The following s^Tiopsis may serve for their identification. A. sle- 



