( 345 ) 



XIX. Observations on the Growth and Habits of the Stick 

 Insect, Carausius morosus, Br. ; intended as a 

 contribution towards a knowledge of variation in an 

 organism which reproduces itself by the parthenogenetic 

 method. By H. Ling Roth, Keeper, Bankfield 

 Museum, Halifax. Communicated bv Prof. E. B. 

 Poulton, D.Sc, M.A., F.R.S. 



[Read October 18th, 1916.] 



Introduction 345 



General Note 347 



Colour 348 



Incubation-Box 349 



Incubation 349 



Incubation under Diverse Conditions . . . .351 



Parthenogenesis 352 



A Male 352 



Form, Size and Weight of Eggs 353 



Fertility of the Eggs 355 



Oviposition . . . • 355 



Abnormalities 35G 



Egg-production 359 



Hatching out 362 



Increase in Length during first Twenty-four Hours 



after hatching out 363 



Growth to the First Ecdysis 365 



The Ecdysis 366 



Growth after the first Twenty-four Hours up to and 



including the last ecdysis 373 



The Insect's Length . 374 



Growth of the Antennae 374 



Food Consumption 376 



Water-drinking 381 



Cannibalism 381 



The Excreta 381 



Protective Measures 381 



Duration of Life . . . m 382 



Death 382 



Variation 383 



Summary of Observations 384 



INTRODUCTION. 



The stick insects dealt with in this paper are descended 

 from a few specimens given me some years ago by Dr. 

 Clubb, Director of the Liverpool Museums. With the 



TRANS. ENT. SOC. LOND. 1916. — PARTS III, IV. (APRIL '17) AA 



