1893. COLOUI CHANGES INO 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 
‘‘ageressive’”’ as well as of ‘ protective” significance. 
Io. 
. Petersen, W. 
REFERENCES. 
. Poulton, E. B.—Further Experiments upon the Colour-Relation between 
certain Lepidopterous Larve, Pupz, Cocoons, and Imagines and their 
Surroundings. Tvans. Ent. Soc. Lond., 1892, pp. 293-487, pls. xiv., xv. 
. Gould, Lilian J.—Experiments in 1890 and 1891 on the Colour-Relation 
between certain Lepidopterous Larve and their Surroundings, together 
with some other Observations on Lepidopterous Larve. Tvans. Ent. Soc. 
Lond., 1892, pp. 215-246, pl. xi. 
. Bateson, W.—On variation in the Colour of Cocoons of Eriogaster lanestris 
and Saturnit carpini. Trans. Ent. Soc. Lond., 1892, pp. 45-52. 
—— .—On Variation in the Colour of Cocoons, Pupe, and Larve ; 
further Experiments. T.c., pp. 205-214. 
. Tutt, J. W.—Variation in the Colour of the Cocoons of Halias chlovana. 
Ent. Record, vol. iii., 1892, pp. 9-12. 

Zur Frage der Chromophotographie bei Schmetterlings- 
puppen. Sitzgsber. Naturf. Gesellsch. Dorpat, vol. ix., 1891, pp. 232-70 
(Abstract in Arch. fiiy Naturgesch., year lviii., 1892, vol. ii., pt. 2, pp. 
154, 5): 
. Tutt, J. W.—Melanism and Melanochroism in British Lepidoptera. 
London, 1891. 
. Merrifield, F.—Systematic Temperature Experiments on some Lepidoptera 
in all their Stages. Tyvans. Ent. Soc. Lond., 1890, pp. 131-159, pls. iv., v. 

.—Conspicuous Effects on the Markings and Colouring of 
Lepidoptera, caused by exposure of the Pupz to different Temperature 
Conditions. Jbid., 1891, pp. 155-168, pl. ix. 
.—The Effects of Artificial Temperature on the Colouring of 
several Species of Lepidoptera, with an account of some Experiments on 
the Effects of Light. Jbid., 1892, pp. 33-44. 
Gro. H. CARPENTER. 
