234 Lilian J. Gould's experiments 



C. fraxini. 



Total number of larvae experimented with, 10. 

 Number in dark surroundings, 5. 

 Number in green surroundings, 5. 



Tlic larvce in dark surroundings. 

 Brownish grey or pinkish drab. ... ... 5 



Exceptions ... ... ... ... ... 



Total 5 



The larva in (jreen surroundings. 

 Delicate bluish "green ... ... ... ... 5 



Exceptions ... ... ... ... ... 



Total 5 



M. hrassicce. 



Total number experimented with, 29. 

 Number in dark surroundings, 15. 

 Number in green surroundings, 14. 



TJie larvcB in dark surroundings. 

 Dark brownish green ... ... ... ... 15. 



The larvce in green surroundings. 

 Dark brownish green... ... ... ... 14. 



Section II. 



1. Notes on a possibly protective habit of larvce of 

 Rumia crattegata. 



In the course of experiments in colour-relation, in 

 June, 1890, I made some observations on a i^eculiar 

 habit ado^jted by the young larvre of li. eratce<iata, which 

 seemed to me possibly significant. Mr. Poulton made 

 numerous observations in previous years on the irregular 

 or spiral attitudes assumed by young Geometer larvae, 

 mentioning the habit as occurring in Epliyra pendalaria, 

 E. omicronarid, E. orbicabiria, Aspilatcs citraria, and 

 A. fjilvaria (Trans. Ent. Soe. Lond., 1884, Part I.), and 

 again in Selenia Innaria and 11. cratceyata (Trans. Ent. 

 Soc. Lend., 1887, Part III.). But in my larvae of the 

 latter species I found this attitude associated with a 

 habit which, so far as I am aware, has not been observed 

 before. 



During the third stage the larvae in cylinders 5 and 9 

 {viz., those with dark and those with green surroundings), 



