16 



birds, in the Zoological Gardens. Mr. Pocock has, as the I 

 result of his experiments, recorded a large number of observa- ' 

 tions bearing upon the theories of cryptic and warning 

 colouring and mimicry. These notes and conclusions will 

 be published by the Zoological Society at no distant date. \ 



1 



I 



15. T/ie Himdredth Anniversary of the Birth of 

 Charles Darwin. 



An examination of the Diptera of the Hope Collection 1 

 revealed a number of flies collected by Charles Darwin in 

 Australia and Tasmania during the voyage of the Beagle. 

 These specimens, which are still in excellent condition, were 

 exhibited at the soiree in the Examination Schools on 

 February 22, 1909. With these were also shown one of 

 the collecting cases taken by Darwin on the voyage, and 

 an interesting letter written by him to Rev. F. W. Hope 

 in 1H37, and referring to the insects which he had brought 

 home. This letter is now published {Dartvin and the " Origin'^ 

 Poulton, 1909, p. 202). 



The Diptera of the voyage referred to above also formed 

 part of the Darwin Exhibition at Christ's College, Cambridge, 

 in the summer of last year. 



16. Seventh Volume of Hope Reports. 



Early in the present summer it is hoped that a seventh 

 volume may be issued. Abundance of material for this 

 purpose exists in the Department. 



Additions to the Collections in 1904. 



The following specimens from Dr. G. B. Longstafif's great 

 Oriental collection, made in 1904, had been added to the 

 bionomic series and were inadvertently uncatalogued until 

 last year : — 



Four butterflies observed to emit pleasant or unpleasant 

 scents ; the Lycaenid butterfly Dendorix melampus, set to 

 show the appearance of a head at the posterior end of the 

 insect, in the resting position. 



