Vol. xxiv] 



ENTOMOLOGICAL NEWS. 



19 



number. In a previous paper ( i ) attention has already been 

 called to the fact that "we have reared a number of Diaphero- 

 mera which were hatched on the same day, fed with the same 

 kind of food and kept in the same breeding cages throughout 

 their entire life history under exactly the same kind of condi- 



TABLE VI. 



PER CENT. OF MALE AND FEMALE DIAPHEROMERA FEMORATA WHICH 

 MOLTED FOUR, PiVE OR SIX TIMES UNDER THE DIFFERENT 

 TEMPERATURES. 



tions of temperature, and yet some specimens molted four 

 times while others molted five times." The effect of tempera- 

 ture, therefore, does not alone explain these differences in 

 the number of molts. 



Summary — A low temperature le)igthens, while a high tem- 

 perature shortens on an average the interval hetzveen molts. 

 A lozv temperature has a tendency to decrease the number of 

 molts, luhile a high temperature increases the number. 



BIBLIOGRAPHY. 



1. Severin, H. H. P., and Severin, H. C, 1910. The Life History of 

 the Walking-Stick, Diapheromera femorata Say. Jour. Econ. Ent. 

 IV, No. 3. pp. 307-320. 



2. Sinety, R. de, 1900. La mue chez les Phasmes du genre Leptynia 

 [Orthopt.]. Bull. Soc. ent. Fr. No. 11, pp. 195-7. 



