hetioeen Icpidojiterous larvm and their surroii,ndings. 321 



A. DARK LARVyE OF BIDENTATA ON JULY 6tH. 



I. Black sticks. — Fourteen out of the 15 larvas were very 

 black, tlie exception being quite small and probably in the 

 3rd stage. These larvce were the darkest of all the sets. 



II. Deep blue |;aj9er spills. — These 12 larvae were very 

 dark, coming next to those upon the black twigs in this 

 respect. The dark purplish-black colour was also very 

 imiform over the whole larval surface corresponding to the 

 unvarying tints of the environment. 



III. Puiplish-hrown tvnc/s. — These 15 Islyvsl) were slightly 

 more variegated than II, in correspondence with the less 

 uniform darkness of their environment. Except for this 

 slight introduction of rather lighter shades these larvae 

 were as dark as II. 



IV. White spotted picoylish-hvum twigs. — These 16 larvae 

 were dark, but distinctly lighter than those of the three 

 previous sets. They also varied a little, whereas the 

 groups first described were more uniform. Although the 

 relative lightness and the darkness of these larvae, as 

 compared with III, corresponded to the general effect of 

 their respective environments, there was no marked 

 resemblance to the special details of the twigs which 

 had been carefully selected for Experiment IV. 



V. Brovjn tvngs. — The 17 larva:' were distinctly brown 

 and not nearly so black or purplish as the preceding sets. 

 The shade of brown varied, being much lighter in the 

 smaller larvae. The brown larval surface was also some- 

 what variegated with different shades of the same colour. 



Va. Bark oversporad vnth a bright yeUowish-greenp)ovjdery 

 lichen. — The 18 larva.^ varied very greatly, some being as 

 dark as the blackest of set I ; many were variegated with 

 shades of brown, harmonizing well with the environment; 

 for the lichen soon lost its green tint and became various 

 shades of brown. This is the only note relating to this 

 experiment which has been found. There is no doubt that 

 the young larvae were introduced on May 22nd or 23rd. 



VI. Lichen-covered sticks. — The lichen was probably dead 

 and had become much paler. These larvce too were much 

 lighter than any of the previous sets, although a few 

 were quite dark. Nearly all were light brown and much 

 variegated with shades of brown, harmonizing well with 

 the environment. 



Of the 7 sets of larva" described above, the degrees of 



