HABITS OF AMBLYSTOMA TIGRINUM AT TOLLAND 26 1 



to be more in use when in motion; the true larvae allow the limbs 

 to come up close to the body and the movement is more by the tail. 

 On several occasions I put a larva into an enclosure formed by my 

 hands which was closed toward deep water and open toward the shore. 

 Although it would swim around slightly it would not pass out toward 

 shore, but waited until my hands were open toward the deep water, 

 when it would pass out rapidly. When not in motion the larvae 

 lie with their feet at right angles to the body and with the gills pro- 

 jecting straight out at the side. By this means the filmy expansions 

 of the gills are freely exposed to the water. 



On the mornings and evenings of June 25, 26, 27, 28 and 29 at 

 7 A.M. and 8 p.m. respectively, along the western and southern shore 

 there were no salamanders in sight. Temperature readings showed 

 that the water was too cold. At night the salamanders go out into 

 deeper water because that is warmer, and they do not return in the 

 morning until the temperature is in the neighborhood of seventy 

 degrees. The data for this statement are shown in the legend to 



Fig. 2. 



From this time on the salamanders stayed in the places I have 

 described, until about July 15, when, owing to a falHng of the lake 

 level, the shore line changed. With the change in shore Hne the 

 salamanders changed their habitat until they found one which was 

 comparable to the one which they had formerly occupied. The shore 

 line on the western and southern side was carried out by the lowering 

 of the lake level until it was at deep water with no chance for the sala- 

 manders to run under rocks. At the southeast end of the lake and 

 only a little way from shore is a submerged bank which runs north- 

 east by south-west along the whole east end of the lake. To the north- 

 west of this bank the depth of the lake was about the same as that of 

 the north-west shore before the change of shore Hne. Here the sala- 

 manders congregated under dense masses of Spirogyra. On the morn- 

 ings and evenings of July 17, 18 and 19 no salamanders were in sight 

 along this shore. Temperature readings showed the same conditions 

 to exist as did in their former habitat. The data are shown below 

 Fig. 3- 



