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THE memoirs contained in the sixth volume of Hope 
Reports were published in the course of the two years 
extending from June, 1906, to June, 1908. In consequence 
of Mr. R. Shelford’s labours and influence the present 
volume contains a far larger proportion of papers devoted 
to insect systematics than any of its five predecessors. 
Memoirs 2-11 are chiefly or wholly concerned with 
bionomic subjects. Mr. T. R. Bell (8), Mr. A. H. Hamm (10), 
Mr. S. L. Hinde (9), Mr. W. J. Kaye (4), and Mr. S. A. Neave 
(2), have each contributed one of these, Dr. F. A. Dixey 
three (5-7), and the Hope Professor two (3) and (11). 
Mr. W. J. Kaye kindly consented to the inclusion of his 
important paper (4), dealing with questions which are 
creatly studied in the Hope Department. A part of the 
material figured in the plates belongs to the University 
Collections, while the whole of the five plates were arranged 
in Oxford, and the four uncoloured ones photographed for 
half-tone reproduction by Mr. Alfred Robinson. Mr. T. R. 
Bell's paper on Indian butterflies (8) was compiled from 
the author's correspondence with Professor Poulton. 
The twelfth memoir by Dr. F. A. Dixey and Dr. G. B. 
Longstaff (12), and the succeeding three papers by Dr. C. B. 
