54 Journal of Entomology and Zoology- 



II is unfortunate that no more transformed individuals were available for the 

 toad, the per cents recorded for if are probably not worth a great deal; however, the 

 fact that no aquatic forms were found even in the five individuals studied is sug- 

 geslive and made understandable by the fact that young toads soon leave the ponds 

 by hundreds and at transformation time can be seen traveling toward the higher 

 ground in all directions. The absence of aquatic or even doubtful forms in both 

 species of llytn can probably be substantiated by the examination of larger numbers; 

 for young tree-frogs and peepers climb on plants above the ponds in which their larval 

 life was spent and, sitting on the leaves and branches of Iris, of shrubbery, or what- 

 ever is available, are ready to catch insects that crawl over the plants or come flying 

 to them. 



It is noticeable, too, that the distribution of the forms eaten through many families 

 and orders is not nearly so great for these smaller species as for the species of Rana. 

 Dr. Wright* has shown that for the Ilhacan Anura the average lengths at transforma- 

 tion are as follows: 



Ilufo americanus 9.6 mm. 



Ilyta versicolor 16.0 " 



llyla trucifer 1 1.0 " 



Rana fiipiens 24.0 " 



Rana patustrts 24.0 " 



Rana sylvatica 16.0 " 



Rana tlamilans 32.0 " 



Rana mlfshfiana 53.0 " 



TTie smaller size of some species naturally limits their food somewhat. The habit 

 in both species of llyla of sitting on plants, and their failure to hop about over the 

 ground as do some of the other forms may also have much to do with the explanation 

 of their eating fewer kinds of insects and other invertebrates such as spiders and 

 sow-bugs. 



In the genus Rana a general tendency toward the habits of the adults is to be 

 observed; although the green-frog is a marked exception. One would expect young 

 bull-frogs to eat a rather large per cent of aquatic forms and the rather low per cents 

 given in I'able 2 for the wood-frog and meadow-frog are not surprising. But the 

 remarkably low per cent for the green-frog was hardly to be looked for. In this con- 

 nection a comparison with the data given by Surface" for the adult forms may be of 

 interest. His report lists the stomach-contents of Z') bull-frogs, of 107 green-frogs, 28 

 wood-frogs, 88 pickerel-frogs, 51 meadow -frogs, 17 peepers, 22 tree-toads, and 52 

 toads. By making a rough estimate of the forms which he lists 1 find that ihe com- 

 parison with the newly transformed is as follows: 



'Wright, A. H.. I9H, I.ifc-hislorics of the Aniir.i of Iiliaci, New York. Cirncgie Institu- 

 tion of Washington. 



'Surface. II. A., 1913. ICconomic features of .Amphibians of Pcnnsvlvnnin. Zoological Bull. 

 Pa.. Dcpt. of Agriculture, i;67\i2. 



