52 



Journal of Entomology and Zoolog>' 



many winter eggs of Crustacea. Aside from tlie few cases of Eitglena, Paramarclum, 

 Difflui/ia and Arcrlla met with, almost all of the remaining food was plant. No 

 attempt was made to make any quantitative observations on the plant materials 

 found. In number of individuals and actual amount of substance the diatoms were 

 very important; many desmids, some filamentous algae, and quite large amounts of 

 wood-fibers and tracheids, bits of leaves and other broken down plant tissues were 

 found. This is another bit of evidence in the rather vast amount which has now 

 accumulated to show the great importance of the diatoms in aquatic biology and 

 ecology. Table 9 shows in a relative way the frequency of occurrence of the various 

 forms of food. 



TABLE 9 



The Frequency Willi Which the Various Species of Tadpoles Contained 



the Various Food-forms. 



S[»ccinii:ns opened 

 UI.\TOMS 



Epilhcmia 



Navicula 



Pinnularia 



Diatoma 



Syncdra 



Xitzchia 



Cymbella 



Mcridion 



Kunolia 



(•nmphpncma 



Miscellaneous 



i-ii..\mi;ntous algae 



/ygncma 



lHothrix 



Spirogyra 



CjnHophora 



MiMiKcotia 



MKifllaneoils 



I'.l.li; C.RKEN AI.GAE 

 < i-icillatoria 



frog frog frog frog frog I'ccpcr toad Toad 



IIKR Af.CAE 



Closlerinm 



Cosmarium 



Prdiafltrum 



Dcsmidiiim 



riciirotxnium 1 . 



Scencdcsmus 



Mr 



opcil 



II.AC.KI.I.ATA 



CKOTOZOA 



Unril-KKA 



CKI STACEA 



IK.r.S Ol' CRUSTACEA 



The figures given in this table indicate the number of stomachs in which the 

 various forms occurred, as no attempt was made to keep a count of the number of 

 times any one form was found in a given stomach. 



Comparison of Young Transformed Individuals of the Various Species. 

 Jnsi a glance given at the data of the transformed individuals of the eight 

 *prcies as presented in the preceding pages, will show in a general way that their 

 fiMid consists largely of insects with some spiders, mites, and other forms, largely as 



