INSTRUCTIONS FOR COLLECTING 
ARACHNIDA, MYRIOPODA, 
AND PERIPATUS. 
Introductory Remarks. 
It is necessary to impress upon collectors the importance of secur- 
ing, if possible, a considerable number of examples of each species. 
Only by this means can the sexual, individual, and age variations be 
ascertained ; and since animals which seem to be identical at first 
sight often prove to be quite distinct when critically examined, the pre- 
servation of large numbers, even from the same locality, lessens the 
likelihood of new species being overlooked. Moreover, since species 
that are exceptionally common are only too frequently neglected 
because their profusion, which after all may be local or temporary, 
suggests the probability of their abundant representation in museums, 
it must be emphatically stated that, with the principal exception of 
a few forms living in human houses, no species is so well known as 
to be unacceptable at the British Museum. 
MYRIOPODA AND ARACHNIDA. 
Habitat. — Millipedes are practically confined to damp localities. 
They may be found under logs of wood, stones, or decaying leaves, 
and frequently climbing bushes and trees, especially after heavy 
rains. 
Scorpions, Spiders, and Centipedes are mostly nocturnal, and may 
be met with in both moist and dry situations, under stones, loose 
bark, felled tree-trunks, in burrows — in fact, in any suitable spot 
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