30 
The entire collection of these obscure little grasshoppers has 
now been arranged, and occupies g cabinet drawers: it com- 
prises 835 specimens, representing 52 genera and 176 species: 
there are 35 type-specimens. A certain proportion of the 
species still await identification and will shortly be sent to 
Dr. Hancock. 
5. Work on the Collection of Pierinae. 
Dr. F. A. Dixey completed the working out of the material 
resulting from Mr. G. A. K. Marshall’s experiments on the 
effect of artificial conditions on seasonally dimorphic species. 
The final results were communicated to the Entomological 
Society of London on Feb. 6, 1907. He also devoted much 
attention to the subject of mimicry, partly with a view to the 
Evening Discourse delivered by him before the British Asso- 
ciation at the Leicester Meeting in August (published in 
Nature, vol. Ixxvi, 1907, p. 673). The mimetic relations of 
African Pierines formed a special object of study, and were 
investigated in connexion with the seasonal and geographical 
variation shown by the forms concerned. Exhibits were pre- 
pared to illustrate many of the results arrived at; some of 
these were shown at the Royal. Society's Conversaziones in 
the summer of 1907, and at the Meeting of the British Asso- 
ciation at Leicester. A part of these and other exhibits will 
remain, permanently arranged as at present, in the Hope 
Department. The work of incorporating accessions to the 
General Collection of Pierines was kept up to date, and pro- 
gress was made in the preparation of a treatise which will 
deal comprehensively with the whole of this group. 
6. Rearrangement of the British Beetles. 
Early in the year the first great section of the British 
Coleoptera, the Geodephaga (Caradidae and their allies) or 
eround-beetles, had been prepared for rearrangement by the 
kindness of Commander J. J. Walker, and by Mr. J. Collins 
working under his direction. The older specimens had been 
cleaned and remounted, all old labels being carefully pre- 
served and copied, when in the previous arrangement a single 
label applied to more than one example. The recent acces- 
