( 285 ) 



XI. A Confrihuliou to our knoivlcih/e of /.he Life-hisiory of 

 the Stick Insect, Carausius morosus Br. By George 

 Tali'.ot, F.E.S. 



[Read March 17tL, lt)20.J 

 Synopsis. 



PAGE 



1. Intkoduction ........ 285 



2. General Life -histories and Descru'Tions of Specimens 286 



3. Egg Development ....... 293 



4. Variation in Eggs ....... 294 



5. Period of Incubation of the Egg .... 294 



6. Period of Incubation of Two or more Eggs deposited 



WITHIN Twenty-four Hours ..... 295 



7. The Ecdyses 296 



8. Summary of Moulting Periods 297 



9. OviPosiTioN . . . ... . . . 297 



10. Post- embryonic Development and Longevity . . 298 



11. Rate of Growth ....... 298 



12. Measurements at Maximum Growth .... 299 



13. Changes in Coloration ...... 300 



14. Coloration at the Final Stage .... 301 



15. Summary . . . . . . . . . 302 



16. The Reconstruction of a Lost Limb . . . 303 



17. Simulation of Death in the NEWiiY-HATCHED . . 303 



18. Mortality ..... .... 303 



19. Varlvtion and Parthenogenesis . . - . 303 



20. Inheritance of Varl\bility ..... 304 



1. Introduction. 

 The observations here set forth were made during the 

 years 1910, 1911, and 1912. They were carried out under 

 various difficulties, and are not so thorough nor so exten- 

 sive as tliose given to the entomological world by Mr. 

 11. ling Roth in his exhaustive paper published in these 

 Transactions for 1916, p. 345. My results are not entirely 

 the same, but the conditions under which the insects were 

 reared were different. The most striking difference is seen 

 in the number of moults ; in most cases only three were 

 observed and four on only two occasions, never five nor six. 



I do not give here any notes on the mode of oviposition, 

 emergence from the egg, and general habits, which differ 

 in no particular from the observations made by Roth. 



The specimens were kept in wooden boxes fitted with 

 glass on one side and perforated on another fide to admit 

 plenty of air. These were stood on end on small receptacles 

 containing water into which the stem of the food-plant was 

 placed. The insects were fed on privet. \Cont. on p. 293.] 



TRANS. ENT. SOC. LOND. 1920. — PARTS I, II. (JULY) 



