Eeport of the Hope Professor of Zoology, 1901. 



The additions to the Collection in 1901 were not so 

 numerous as in 1900. Nearly 6,400 specimens received in the 

 latter year have now been catalogued and incorporated, and 

 large numbers still remain to be included. The most important 

 of these is the very fine consignment from Sarawak, Borneo, 

 presented by R. Shelford, Esq., M.A., Curator of the Sarawak 

 Museum. 



About 2,000 specimens presented in 1901 have been in- 

 corporated, and are acknowledged in detail in the later part 

 of this Report. When the whole of the 1901 accessions are 

 included, the numbers will probably not exceed 4,000 

 altogether. The most important and valuable of the gifts 

 already catalogued are the following. 



The Rhodesian insects collected and forming the material 

 of important experiments by Guy A. K. Marshall, Esq., are 

 of inestimable value to the Department. The specimens have 

 in large part been specially collected and specially observed 

 to afford evidence bearing on various biological problems of 

 the highest interest and importance. Some of these experi- 

 ments have been described by Mr. Marshall (Ann. and Mag. 

 Nat. Hist. 1901, vol. ii. p. 398); Dr. F. A. Dixey has 

 discussed nearly the whole of Mr. Marshall's material bearing 

 on seasonal dimorphism in butterflies and its causes, and has 

 compared it with a large amount of other material from other 

 parts of the world, in the Hope Department (Trans. Ent. Soc. 

 Lond., 1902, p. 189); while the remainder of Mr. Marshall's 

 specimens and an immense mass of observations recorded by 

 him have been communicated to the Entomological Society 

 of London, and will appear later in the year. This last paper 

 describes the whole of the South African material bearintr on 

 mimicry, warning colours, the struggle for existence in 

 insects, &c., accumulated by a matchless observer during the 

 five years ending with the close of 1901. Owing to the 

 generosity of Mr. Guy Marshall, the whole of this invaluable 



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