KUNGL SV. VET. AKADEMIENS HANDLINGAR. HAND 47. \:C) 6. 



33 



The same was the case with specimens from German East Africa. In Boulenger 1 

 catalogue is stated that in this species the tarso-metatarsal articulation reaches the 

 tympanum, but in these specimens as well as in those from German East Africa it 

 reaches at least the middle of the eye. A closer examination showed, howevei. fchal 

 this difference is only due to age. The table below indicates hovv the extremities 

 decrease in relative length with age, especially the hind limbs, and most evident] y 

 the tarsus and the foot. 



Length of extremities in Cassina senegalensis in °/ of length of body. 



No. 1 



Length of body . . 26 



Femur in °/° of body 3S.5 



Tibia in °/o of body . . 37.7 



Tcf/rsus in °/° of body . 61.5 

 Whole hind limh in °/° of ! 



body I 137.7 



Före limb from elbow in 



°/o of body 56.2 



No. 2 No. 3 No. 4 



32 



40.3 

 37.2 

 fil. 9 



139.4 



32 



40.9 

 38.4 

 62.5 



141.8 



53.1 i 56.2 53.7 



<? 



33..". 



39.1 



37.3 



59.2 



135.0 



No. 5 



33.5 

 38.8 

 38.2 

 61.5 



138.5 



54.3 



No. 6 No. 7 No. 8 No. 9 No. IO1N0. 11 No. 12 .No. 13N... i i No. 15 No. 16 No. 17 



O" 



35 



37.1 



36.6 



60.3 



134.0 



36 



38.1 

 36.1 

 60 



134.2 



36 

 36.7 

 34.2 

 57.8 



128.7 



9 

 36 

 38.9 

 36.7 

 60 



135.6 



54.3 52.8 52.8 53.9 50.5 48.2 



38 

 36.8 

 35.8 

 56.6 



129.2 



a* 



38 



34.2 



32.9 



56.1 



123.2 



9 



38.2 

 34.0 

 34 

 52.9 



121.5 



49.7 



39 

 38.5 

 35.9 

 55.1 



129 5 



42.2 

 33.2 

 32.4 

 53 5 



119.1* 



.7 42.7 



45 



35.8 



31.0 



48.9 



116.3 



46.9 



45.5 

 33.0 

 31.2 

 50.1 



114.3 



46.2 



17 



36.2 

 319 

 49.0 



117.7 



44.9 



No. 1—3, 5, 7 are from German East Africa, No. 4, 6, 8, 9, II, 12 from British 

 East Africa (this collection), No. 10, 15, 16 from Caffraria, No. 13 from Zululand, 

 and No. 14, 17 from Port Natal. 



The gular adhesive disk of the males also appears to be rather variable, but 

 this variation is not due to age. Among the specimens from British East Africa 

 there are 4 males; in 3 of them the adhesive disk is considerably larger than that 

 in the 4th. In two specimens of about the same size (35 mm.) the disk is 8.5 mm. 

 in length in the one, and 5 mm. in the other. In all of them the breadth is about 

 similar to the length. The same variation vve find also in specimens from other 

 localities. In the large specimens from South Africa the disk is generally squarish 

 oblong, but in one specimen from Natal it is nearly circular. Therefore I do not 

 think it right to establish distinct species upon the size and form of the adhesive 

 disk of the males. 



In this connection I wish also to say that in several specimens of the Cassina 

 senegalensis, kept in the Royal Museum of Natural History, there are distinct rudi- 

 ments of web on the toes. According to the diagnosis of Cassina ivealii Blgr. this 

 species should differ from C. senegalensis by its dissimilar disk and distinct rudiments 

 of web. As shown these characters are of little value which also Boulenger notes 

 in Proc. Zool. Soc. 1907, p. 482. Yet, in his revision of the batrachians of South Africa 

 1910, he distinguishes the two species by the presence or absence of a rudiment of web. 



The species is distributed all över the whole East African region from Somali- 

 land to Cape, and is found in Angola and Damaraland as well. 



K. Sv. Vet. Akart. HaniU. Band 47. N:o 6. 5 



