KUNGL. SV. VET. AKADEMIENS HANDLINGAR. IJAN1) 47. \J> 6. 



27 



speak of any defined spöt. The dark stripe along the upper horder of the jav and 

 that through the eye, as well as the dark spöts on the sides of the bodj are missing 

 in all specimens; nor dowe find the light irregular band that runs in othcr specimene 

 from the angle of the moutli to below the eye between the temporal spöt and the 

 dark börder of the upper jaw. The web is more developed than in the preceding 

 specimens, even than in that from Blue-Post, the foot in these ones being nearl\ 

 entirely webbed (fig. 1 b). As is shown by my figures 1, the extension of the web 

 may also be rather variable in this species. 



In the paper quoted above Fr. Nieden says that this species probably is not 

 specifically distinct from Råna delalandii Dum & Bibr. (= R. angolensis Bocage). 

 According to Nieden, Boulenger also should accept this opinion. As Nieden in- 

 tends to discuss this question in a forthcoming paper, I will not go farther into the 

 matter, but I wish to say that these specimens, according to my opinion, are rather 

 dissimilar from specimens of R. delalandii, examined by me. In these specimens of 

 R. nutti the hind limbs are mnch shorter and the body stouter, besides there are 

 only two folds on the back, one on each side, and no black spöts on the middle of 

 the back between the lateral folds. In R. delalandii the whole back is spotted and 

 provided with numerous short dermal folds. Yet, I must say that it seems, as if 

 one of the specimens of R. nutti, figured by Boulenger (fig. 1), should be an inter- 

 mediate form; it resembles a R. delalandii D. & B. in a rather high degree. 



If it really should be proved that Råna nutti Blgr. is only a short-legged R. 

 delalandii D. & B., I believe that also R. fuscigida D. & B. ought to be connected 

 with this one. R. fuscigida and R. delalandii are completely like each other in colour 

 and habitus, and in my opinion they agree still rnore than R. nutti and R. delalandii. 

 The only difference I can see between them is the length of the limbs, which are 

 considerably shorter in R. fuscigida than in R. delalandii. As shown by the table 

 below, Råna nutti is an intermediate form in this respect, and — as far as I can find — 

 it ought to be connected with R. fuscigida on equal grounds as with R. delalandii. 



Comparison between the length of the limbs in 



/,'. delalandii 



R. nutti 



R. fiifscii/iila 



Length of the specimen from nose to ven t 



55 mm ef 



67.5 mm ef 



62 mm ef 



» femur in % of the length of body . . . 



59.1 



56.3 



48.4 » 



tibia » ... 



64.5 



56.3 » 



50 



tarsus with 4th toe ... 



89.1 » 



80 



72.6 



» the whole hind limb » ... 



212.7 



192.6 



171.0 



» the före limb . . . 



69.1 » 



66.7 



61.3 » 



Råna mascareniensis Dum & Bibr. 



IJli.i... Cat. Batr. Sal., p. 52. 



18 specimens; 16 males, 1 iemale, from a grassy, waterdrenched plain in the 

 Forest reserve at the Limuru-road, not far from Nairobi, 9 /* 1911; 1 female, Escarp- 

 ment Jan. 1911. 



The species is known from the whole Ethiopian region. 



