294 



INEZ WHIPPLE WILDER. 



during the fall, winter, and early spring months, and that, as 

 shown by Table II. and its accompanying Graphs III. and IV., the 

 average proportions and size of the body remain practically the 

 same until late spring, when there occurs a marked increase in 

 average size and a decided change in the proportionate lengths 

 of the regions of the body in that the tail lengthens more rapidly 

 than either the head or trunk. Structurally, also, the specimens 

 taken during the fall and winter display none of the indications 

 of approaching metamorphosis which are so unmistakable when 

 they do appear in the May specimens. Moreover I have never 

 found larvae actually undergoing metamorphosis except in June, 

 nor any of the very small recently metamorphosed adults except 

 in June and the early part of July. The aquatic larval period 

 would thus appear to extend practically through autumn, winter, 



TABLE II. 



AQUATIC LARVAL PERIOD. 



