HABITS OF AMBLYSTOMA TIGRINUM AT TOLLAND 263 



(i) The most important features in the change from larval to 

 adult stage. 



(2) Distribution and some characteristic habits of the larvae in 

 the lake under observation. 



(3) The distribution and some characteristic habits of the adults. 



(4) Some temperature features as follows: 



(a) If the salamanders are to be active, the water must be of 

 a favorable temperature, close to seventy degrees Fahren- 

 heit. 



(&) During the day they choose the shallow water close by 

 deep water because the temperature there is nearest 

 seventy degrees. 



(c) At night they go out to deep water because it does not cool 

 to so low a point as does the shallow water. 



(d) They return in the morning from the deep water to the 

 shallow water only when the temperature of the latter 

 has risen above that of the former. 



