On a new Frog from Mossamedes. 109 



of head, not reaching origin of anal. Caudal rounded. 

 Caudal peduncle as long as deep. Scales denticulate, 

 36-39 j^; lateral lines 21-24/13-17. Brownish above, 

 yellowish beneath, with dark brown spots or marblings or 

 with 7 or 8 indistinct dark bars on the body ; a blackish 

 opercular spot; dorsal, anal, and caudal fins with round 

 brown or blackish spots. 



Total length 160 mm. 



Several specimens were obtained by Dr. Ansorge. A 

 specimen measuring 215 mm., from the Zambesi, has been 

 submitted to me by Dr. J. D. F. Gilchrist. 



Closely allied to P. robusta, Gthr. 



XX. — Description of a new Frog discovered hy Dr. W. J. 

 Ansorge in Mossamedes^ Angola. By G. A. Boulengek, 

 F.K.S. 



Rana cryptotis. 



Tongue rather feebly notched behind. Vomerine teeth in 

 two oblique groups between the choanfo. Habit very stout. 

 Head short, snout rounded ; interorbital space narrower than 

 the upper eyelid; tympanum completely hidden under the 

 skin. Fingers short, pointed, first and second equal ; toes 

 short, one-third webbed ; subarticular tubercles of toes very 

 prominent, conical; inner metatarsal tubercle very large, 

 very prominent, shovel-shaped, sharp-edged, at least as long 

 as the inner toe ; a small, round, outer metatarsal tubercle ; a 

 round tarsal tubercle, just below the tibio-tarsal articulation. 

 The tarso-metatarsal articulation reaches the eye. Skin 

 smooth. Pale greyish or browrjish above, with dark-edged 

 grey or brown spots disposed with greater or less symmetry ; 

 an interrupted dark cross-bar between the eyes ; back some- 

 times with white or pink dots ; a light vertebral stretik often 

 present ; hind limbs with dark transverse spots, not forming 

 complete cross-bars ; lower parts white. 



From snout to vent 31 mm. 



Numerous specimens were obtained by Dr. Ansorge at 

 Catequero, Pouang Kuma (Dongwennu), and in the Kafitn 

 Swamps. 



The hidden tympanum and the tarsal tubercle well distin- 

 guish this small frog from R. Delalandii and other allied 

 species from Africa. 



