9 
“ At the present time the space devoted to the Pierinae con- 
sists of 5 cabinets of 60 drawers each—3o00 drawers in all. 
Each specimen has been carefully considered and placed in 
the position that may best illustrate its natural affinities and 
relation to conditions of locality and season. The genera 
and species have been indicated throughout by easily-read 
labels, and synonyms have been added when they possess 
special interest or importance. The order of the species 
within each genus, and of the genera within the sub-family, 
has been determined with the view of exhibiting the probable 
relationship of the various forms on a phylogenetic basis. 
With every genus and every species a map is given, coloured 
to show the present distribution of the particular assemblage 
on the earth’s surface. Within the limits of each species the 
individual specimens are arranged geographically, according 
to a uniform plan; seasonal modification of forms, where it 
exists, is duly indicated by special labels. Every specimen, 
except a few for which no data exist, is accompanied by 
a label, generally printed, on which all available details of 
locality, date of capture, names of collector and donor, &c., 
can be read ata glance. The specimens belonging to such 
historical collections as those of Burchell, Belt, Bates, and 
Wallace can thus be readily identified, and every ‘type’ 
specimen bears a distinctive mark. In addition to the 
general collection there are also special series illustrating 
points of biological interest; for example, (1) the results of 
Mr. Marshall’s valuable experiments on the epigonic rela- 
tions of various forms of African Pzerinae, and their reaction 
to diverse conditions of moisture and temperature; and 
(2) a series of forms of Indian Caéopsilia relied on by the late 
Mr. de Nicéville to establish his view of their specific identity. 
These series, with printed data, are all inserted in their proper 
place under the general arrangement. In all parts of the 
collection, wherever a particular specimen has been figured or 
referred to in any published work, attention has been drawn 
to the fact and the reference given. In many cases MS. notes 
have been added.” 
