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ENTOMOLOGICAL NEWS. 



[Jan., '13 



perature are compared in the following table, it is seen that 

 the interval between molts is considerably shorter under a 

 high temperature. The same is true, with two exceptions, of 

 the male and female walking-sticks which passed through five 

 molts under nearly normal conditions and six molts under a 

 high temperature (Table III). 



One would not hesitate to conclude from these results that 

 a high tempcrattcre shortens, on an average, the interval be- 

 tween molts. 



TABLE III. 



AVERAGES IN DAYS OF THE STAGES BETWEEN MOLTS OF DIAPHERO- 

 MERA FEMORATA REARED UNDER NEARLY NORMAL CONDITIONS 

 AND A HIGH TEMPERATURE OF 25° TO 35° C. 



De Sinety (2) reared a walking-stick, Leptynia attenuata, 

 at 30 degrees C. and found that, while the specimen completed 

 its development more quickly under these conditions, yet the 

 acceleration in development did not afifect the interval between 

 the four molts equally. He writes, "tandis que le premier est 

 peu abrege, le deuxieme et le troisieme le sont beaucoup et le 

 quatrieme est allonge." 



In another experiment, ten male and five female walking- 

 sticks were reared during the somewhat colder months of 

 April, May and the early part of June. The following table 

 shows the inter\'al between molts and the post-embryonic de- 

 velopment of each group of walking-sticks, the grouping being 

 made according to sex and the number of molts. 



