108 



BULLETIN 151, UNITED STATES NATIONAL MUSEUM 



are somewhat bluntly rounded, a diflference of considerable impor- 

 tance. Breeding females are rarely as small as the males; at least 

 none of the Mount Sagalla females are under 17 mm. in length. 



The Mount Sagalla series show remarkable uniformity in leg de- 

 velopment, the tibio-tarsal articulation of the adpressed hind limb 

 marking the eye (or a trifle behind or before) in 41 frogs, the two 

 exceptions are both females (Nos. 49324, 49327), where it only reaches 

 the axilla or tympanic region (the tympanum is hidden in this species). 

 In the Gondokoro and Mount Gargues specimens, with one exception, 

 the articulation reaches the nostril; the exception (No. 49251) and 

 the Mount Kenya and Victoria Falls frogs show a slightl}'^ longer 

 limb where the articulation reaches the end of the snout. In all the 

 specimens the interorbital space is noticeably broader than the upper 

 eyelid. 



In coloration the Mount Sagalla series is reasonably uniform ; only 

 two frogs have a trace of a vertebral line; in No. 49336 (female) it is a 

 broad band, 3 mm. in width; in No. 49357 (male) it is only 1 mm. 

 wide, agreeing in this respect with the frog from Victoria Falls; a 

 hairlike vertebral line is present in the Mount Kenj^a frog as well as 

 one from Gondokoro and a Mount Gargues specimen. Two of the 

 Mount Gargues series have very broad vertebral bands. Three of 

 the Sagalla males (Nos. 49358,49360,49366) show a large light spot 

 on the middle of the head; in its center is a dark triangular mark 

 which occurs in other members of the genus; a second light spot, 

 dark-edged anteriorly, occupies the center of the back. 



The material in the Museum of Comparative Zoology has been re- 

 examined with a view to throwing further light on the variation of 

 this species and the possible validity of the two forms now relegated 

 to the synonymy. The essential information may be briefly sum- 

 marized as follows: 



Of the two closely related species described from East Africa, A. 

 alhifer is only known from the type, and unfortunately it has been 



