( V ) 
It is found, in practice, that a box made according to Fig. 1 
will carry—without overcrowding—from 100 to 130 full 
envelopes in the larger trough, and from 175 to 200 in each 
of the two smaller spaces. Design 2 will hold, in each of the 
four spaces, 225 Lycaenidae, making a total of 900 insects. 
Design 3 will hold 75 or more filled envelopes in each of the 
two spaces. 
For convenience of examination, the insects should be 
arranged in families : the genera alphabetically in each family. 
Fig. 3. 
and the species alphabetically in each genus. Subsequent 
additions can be slipped into their places without disturbing 
those already in position. To keep the envelopes in place, 
when the troughs are only partly occupied, triangular blocks 
of cork—about f in. thick—can , be employed. For use as 
collecting boxes, the troughs can be charged with empty 
envelopes, and the cork triangles will serve as markers to 
separate off the unused envelopes as they are filled. 
The boxes illustrated are of the simplest design—as made 
by a local tinsmith in Ceylon. They can be improved by a 
coating of black japan on the outside. 
