i8 



ENTOMOLOGICAL NEWS. 



[Jan., '13 



56.8 days (Table V). A comparison of the averages of cor- 

 responding stadia of the male and female Phasmids which 

 were subjected to differences in temperature, shows that the 

 interval between molts is longer on an average when the insects 

 are kept in a cold temperature. It is evident, thus, that a low 

 temperature lengthens, on an average, the interval between 

 molts. 



TABLE V. 



AVERAGES IN DAYS OF THE STAGES BETWEEN MOLTS OF DIAPHERO- 

 MERA FEMORATA REARED UNDER NEARLY NORMAL CONDITIONS 

 IN JUNE, JULY AND AUGUST, AND IN THE SOMEWHAT COLDER 

 MONTHS OF APRIL, MAY AND THE EARLY PART OF TUNE. 



It is apparent that the effect of temperature on the dura- 

 tion of the stages, and the influence of temperature in deter- 

 mining the number of molts, are two entirely different prob- 

 lems. To ascertain what effect temperature has on the number 

 of molts that the walking-stick undergoes, the following table 

 should be examined : 



An examination of Table VI shows that of the five speci- 

 mens reared under the high temperature, three molted six 

 times and not a single individual four times; also, of the fif- 

 teen Phasmids that were kept at the low temperature, five 

 molted four times, ten five times, and not a single specimen 

 six times. While the number of Diapheromera kept at the low 

 and high temperatures is not exceedingly large, still these re- 

 sults show that a high temperature has a tendency to increase 

 the number of molts, while a low temperature decreases the 



