380 Mr. F. Merrifield and Mr. E. B. Poulton on 



at rest on the sarfaco upon which they will afterwards 

 pupate. (Phil. Trans. 1887, I.e.) Allowance must be made, 

 on the other hand, for the possible disturbance of larvae 

 after they have entered the susceptible phase. 



Colours of the different surrowidings. 



Besides these black or coloured cylinders or bottles I 

 had clear glass cylinders or bottles supplied with the other 

 objects enumerated below for the pupre to attach themselves 

 to, some also being shut up in absolute darkness. The 

 result was that I obtained several cla.«ses of pupoe, viz. 

 from — 



1. Black paper {(i) in strong light, {h) in more or less 

 shade. 



2. Dark sticks from old faggots or freshly-cut dark 

 alder. 



3. Dirty white paint, being that of a breeding-cage ten 

 years old. 



4. Darkness. 



5. • Light-coloured dry stems (dead stems of Einlohium 

 hirsutum). 



6. Dead reeds, light brown in colour. 



7. Dull green reeds. 



8. Bright golden yellow oatstraw. 



0. Dutch "gold," with embossed pattern. 



10. Green paper (a) in strong light, (h) in more or less 

 shade. 



11. Green carrot-tops. 



12. White paper {a) in strong light, (li) in more or less 

 shade. 



13. Yellow paper (a) in strong liglit, (J)) in m>rc or less 

 shade. 



14. Yellow orange leno {a) in strong light, {h) in shady 

 corner. 



15. Orange paper (a) in strong light, [h] in shady 

 corner. 



Some of these had the further differences which are 

 indicated in the e.xhibit and described in the classification 

 of the pupiE. 



I exhibit the results of all these exposures, 72 individuals. 

 All of these may repay study ; the details will be described 

 by Prof. Poulton. I could perhaps have made the Exhi- 

 bition Case more attractive as well as more effective for 

 purposes of comparison had I detached the pupse from the 



