272 



INEZ WHIPPLE WILDER. 



On October 6 one specimen more was killed (stage ), and on 

 October 14 all of the remaining ones which could be found, three 

 in number (stage F). 



Since by this time the larvae had not only reached the water 

 in the bottom of the jar but had attained the size and proportions 

 of the aquatic larvae collected from their natural habitat at this 

 season of the year (cf. Table I., and Graphs I. and II.), it maybe 



TABLE I. 



(The measurements given in this table are approximately those of the head, 

 trunk, and tail, respectively, though, for convenience in measuring, the axilla and 

 the anterior angle which the posterior limbs make with the body were taken as the 

 somewhat arbitrary limits of these regions, cf. Plate II., n, dotted lines.) 



TERRESTRIAL LARVAL PERIOD. 



considered that the duration of the terrestrial larval period is ap- 

 proximately 15 or 1 6 days, the average age of stage F. That the 

 duration of the terrestrial period is very variable will, however, 

 be inferred from the fact that in the case of this particular brood 

 a difference in activity led some of the larvae to the water several 



