xi INTRODUCTION. 
he discarded the fanciful terms by which they were distinguished, and adopted the more 
descriptive term Diuwrna, or day-flyers, for the first section ; Crepuscularia, or twilight-flyers, for 
the second division ; and Nocturna, comprising the night-flyers, for the last. The more recent 
method, however, adopted by Dr. Boisduval, in which only two great subdivisions are recognised 
instead of three, has been generally adopted in the scientific world. The great order Lepidoptera 
is, therefore, now divided, first into Lhopalocera, or those having clubbed horns, or antenne, 
from the Greek ropulon (gérurov), a club, or knob ; and ceras (agus), a horn; and secondly, into 
Heterocera, consisting of such as have various kinds of antenne, but never clubbed—the last term 
being composed of the Greek words cteros (2r<go¢), dissimilar, with the addition of ceras, a horn, as 
before. 
These scientific terms, Lhopaloceruw and Heterocera, correspond very naturally and con- 
veniently with our popular terms, Butterflies and Moths, and serve to separate the great scale- 
winged family in a precisely similar manner. 
It is only with the first division, Rhopalocera, or Butterflies, that we have to do in this 
volume: and of these, only with that small section which are natives of the British Isles, among 
which, however, will be found some remarkably beautiful species, and much to interest the 
student in tracing their metamorphoses, their habits, their distribution, and their classification. 
With “Part Ten” of this work some account will be given of the best mode of capturing 
Butterflies ; also of rearing them from the egg or Caterpillar stages. It will also be shown in a 
detailed account of some portions of the physiology of insects, that the power of appreciating 
pain is almost entirely absent in their organisation ; and that, therefore, Entomological pursuits 
are entirely free from the charge of cruelty which has been so often and so ignorantly urged 
against them. 
