592 BIONOMIC NOTES 
Feb. 22. Kandy. Some rain morning, rather heavy 11p.m. [reported 
heavy, Anantapura]. 
„ 24. Dambulla. Showery. 
„ 25. Anantapura. Heavy showers throughout morning. 
Mar. 5. Hatton. Very slight rain, afternoon. 
„ 6. Hatton. Kain midday for over an hour. 
„ 7. Hatton. Heavy rain, 2-3 p.m. Thunder. 
„ 14. Bandarawela to Nuwara Eliya. Heavy rain, noon to 5 p.m. 
„ 15. Nuwara Eliya. Heavy rain, 2 p.m. Thunder, 4 p.m. 
„ 16. Nuwara Eliya. Heavy rain, noon to 1 p.m. 
§ 14. The Selection as Resting-places of Yellow Leaves by 
Yellow Butterflies. 
Intimately bound up with the attitude at rest is the question 
whether or no insects select resting-places of a character likely to 
make the most, so to say, of their cryptic colouring. 
As there still appear to be entomologists of wide experience who 
doubt whether butterflies, impelled by instinct, ever select resting- 
places of like colour with themselves, it seems worth while to bring 
together the following facts. 
Mr. A. H. Hamm has made some striking observations tending 
to an affirmative answer to this question. 1 He stated that in 1904 
he had some thirty plants of Cactus Dahlia growing in his garden: 
two were pure white, the rest of various colours. On three evenings 
he saw a male of Ganoris rapae at rest, each time on a white flower. 
In the discussion which followed, Dr. T. A. Chapman mentioned that 
he had once followed a specimen of Colias edusa for a considerable 
distance, and observed that it invariably came to rest upon a yellow 
leaf. Following up his observations in 1905, Mr. Hamm observed 
five more examples of Ganoris rapae. Two were well concealed 
among the flowers of the White Dead-nettle (Lamium album), three 
were resting on the silvery undersides of Bramble leaves. In the 
interesting discussion which followed, Mr. H. Rowland-Brown said 
that he had known Ganoris napi rest for the night on the white 
flower of a Leucojum. Col. J. W. Yerbury mentioned the case of 
Euchloe euphenoides and Zegris eupheme in Spain roosting on the 
flower heads of Biscutella [a Crucifer with yellow flowers] ; Dr. T. A. 
Chapman said he had seen the same thing in the South of France. 
I have myself observed at Mortehoe (August 15th, 1910) a male 
1 Proc. Ent. Soc. Lond ., 1904, p. lxxv., and Proc. Ent. Soc.Lond „ 1905, p. Jxxiii., 
9,nd the interesting discussion following the latter paper, 
