Pomona College, Claremont, California 53 



has been reported for the adults by previous workers. I think it is worth while, 

 however, to go into more detail and to see, for example, whether the young frogs and 

 toads change at once to the more or less terrestrial habits of the adults or whether 

 they feed largely on the aquatic forms at first. Let us see, too, whether they are 

 limited very much by their size as to their range of food, and whether they begin 

 their predaceous habits at once or still feed on the diatoms and algae on which they 

 grew. 



Perhaps a table comparing the different species will show most readily what we 

 desire. In Table 10 the animal forms contained in the stomachs examined have been 

 listed, the attempt being made to separate those which are without question aquatic 

 from those probably not taken in water. The CoUembola, young Anura, and insect 

 eggs might have been taken on water or not and are classed as doubtful. It is possible, 

 of course, that any of the winged insects might have fallen into water and have 

 been seized as they were struggling or floating on the water, but this could scarcely 

 have been true of many. Anyone who has watched transforming Anura knows that 

 they hop briskly about in the neighborhood of the pond and have every opportunity 

 to catch their prey in the air, from the surface of the mud, or from plants. 



TABLE 10 



Relative Numbers of Aquatic and Non-aquatic Animal Forms Found in 



Transformed Individuals. 



Protozoa 



Water Snails 



Crustacea and eggs 16 



Water Mites 1 



Odonata Nymphs 3 



-Aquatic Hemiptera 



Chironomid LarvK 



.Aquatic Coleoptera 6 



Rana Tadpole 1 



TOT.AL AQUATIC FORMS 31 



CoUembola 19 



Eggs 2 



Young Anura 2 



Doubtful Forms 23 



Wrmes 



Land Snails 



Land Crustacea 1 



Mvriapods 



Spiders 1 



Land Mites 1" 



* Land Insects "_ 



Adult Odonata 5 



Thrips 



Crickets 



Land Hemiptera ^^ 



Scorpion Flies 1 



Psocids 1 



Lepidopterous Larvie 1 



niptera ^ 



Dipterous Larvi 



Coleoptera 21 



Coleopterous Larvx 



Hvmcnoptcra 6 



TOT.SL XON-AOUATIC FORMS 71 



TOT.M. AXIM.VL forms 125 



Per Cent .\quatic Forms 25% 



Per Cent Doubtful Forms 18% 



Per Cent Land Forms 57% 



Number of Stomachs 29 



•Not furtber identifiable. 



Bull- GrL 



frog frog frog frog frog Peeper toad Toad 



