PREFACE. ix 
acquiring a knowledge of the science, a complete 
view of the systematic arrangement, agreeably to 
the best authors, will be subjoied to future num- 
bers, by the help of which, when the work is com- 
pleted, it may be bound up with the correct succes- 
sion of genera. 
A glossary also will be given, in which the no- 
menclature will be defined as concisely as possi- 
ble, and with reference to figures. 
Much confusion has resulted to natural history 
from the injudicious multiplication of species by 
many naturalists too solicitous of distinction, and 
from the unwarrantable and highly reprehensible 
substitution of new specific designations for those 
already adopted, by those naturalists who pursue 
the science not for its own sake only. ‘This I shall 
studiously avoid. In no case whatever, in this 
work, will a specific name be changed, unless 
such name has been applied toa different insect of 
the same genus, or unless it be through a want of 
better information on the subject. 
- With these prefatory observations I take leave 
B 
