iS93. COLOUR CHANGES IN INSECTS. 293 



be due entirely to the action of natural selection, or to some direct 

 influence of the environment, experiment may perhaps decide. There 

 can be little doubt that, to spiders, such correspondence is of 

 " aggressive " as well as of " protective " significance. 



REFERENCES. 



1. Poulton, E. B. — Further Experiments upon the Colour-Relation between 



certain Lepidopterous Larvae, Pupae, Cocoons, and Imagines and their 

 Surroundings. Trans. Ent. Soc. Lond., 1892, pp. 293-487, pis. xiv., xv. 



2. Gould, liilian J. — Experiments in 1890 and 1891 on the Colour-Relation 



between certain Lepidopterous Larvae and their Surroundings, together 

 with some other Observations on Lepidopterous Larvae. Trans. Ent. Soc. 

 Lond., 1892, pp. 215-246, pi. xi. 



3. Bateson, W. — On variation in the Colour of Cocoons of Eriogaster lanestris 



and Saturnia carpini. Trans. Ent. Soc. Lond., 1892, pp. 45-52. 



4. . — On Variation in the Colour of Cocoons, Pupas, and Larvae ; 



further Experiments. T.c, pp. 205-214. 



5. Tutt, J. "W. — Variation in the Colour of the Cocoons of Halias chlorana. 



Ent. Record, vol. iii., 1892, pp. 9-12. 



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 (Abstract in Arch, fur Naturgesch., year Iviii., 1892, vol. ii., pt. 2, pp. 

 154.5)- 



7. Tutt, J. W. — -Melanism and Melanochroism in British Lepidoptera. 



London, 1891. 



S. Merrifield, F. — Systematic Temperature Experiments on some Lepidoptera 

 in all their Stages. Trans. Ent. Soc. Lond., 1890, pp. 131-159, pis. iv., v. 



g. . — Conspicuous Effects on the Markings and Colouring of 



Lepidoptera, caused by exposure of the Pupae to different Temperature 

 Conditions. Ibid., 1891, pp. 155-168, pi. ix. 



-The Effects of Artificial Temperature on the Colouring of 



several Species of Lepidoptera, with an account of some Experiments on 

 the Efi'ects of Light. Ibid., 1892, pp. 33-44. 



Geo. H. Carpenter. 



