Donaldson, Aynencan and European Frogs. 



125 



and that on the average, the lower figures differ only 4.1 per cent 

 (R. pipiens) and 2.3 per cent (R. temporaria) respectively, from 

 the highest figures, given by R. esculenta. The relation of body 

 weight to total length is therefore nearly the same in all three 

 species. 



(4) In the fraction of the total length represented by the com- 

 bined lengths of the leg bones. 



Table 2 gives these figures in their final form. 



TABLE 2. 

 Percentage of the total length represented by the combined lengths of the leg bones. 



R. pipiens. . . . 

 R. esculenta. . 

 R. temporaria. 



No. OF 

 Specimens. 



12 68.7% 



5 70.7% 



6 69.4% 



The percentages in the foregoing tables were obtained as fol- 

 lows: That for R. pipiens from an average of twelve records 

 on individuals ranging from 14.85 to 42.54 grams in body weight 

 (Donaldson and Schoemaker, 'go, Table VII) ; that for R. escu- 

 lenta from five specimens of the Zurich series of 1898, having a 

 body weight of 12.3-20.4 grams; and that for R. temporaria 

 (fusca) from six specimens of the same series ranging in body 

 weight from 17.9-34.7 grams. 



Table 2 serves to show that in this character the three species 

 are nearly alike. 



(5) In the proportional lengths of the several leg bones. 



table 3. 



No. OF 



Specimens. 



Femur. 



Tibia. 



Foot 



(Tarsus and 



Pes). 



R. pipiens. . . . 

 R. esculenta. . 

 R. temporaria. 



25.5% 

 26.3% 

 26.1% 



29-3% 

 28.2% 

 28.7% 



45-2% 

 45-5% 

 45 -i^ 



The figures in Table 3 are based on the same data as were used 

 for Table 2. For comparison in the case of R. esculenta how- 

 ever, we have in addition, the measurements from Boulenger 

 ('97). These are taken both from his tables and from measure- 

 ments made on the bones as represented in his plates. 



