PREFACE. x1 
cimens; but sometimes, when no British specimen of one 
sex was known, I have inserted the best foreign descrip- 
tion in inverted commas, that it may be recognised when 
found. 
I have only further to remark, that as a portion of this 
book, viz. as far as sheet u inclusive, to page 112, was 
printed as long back as August, 1835, and the six fol- 
lowing pages were then in type, to which no alteration 
was made upon resuming the work within these two 
months, all subsequent discoveries, and remarks, upon the 
insects previously described, are, unavoidably, thrown into 
an appendix at the end. 
In the use of terms, I have almost exclusively restricted 
myself to those employed by Messrs. Kirby and Spence, 
unless obliged by paramount considerations to deviate 
from them; and it is necessary to observe, that all the 
insects were examined under a lens of a moderately high 
power, which, as sculpture very generally constitutes the 
specific distinction, will be found essential to the removal 
of all doubt as to their identity and determination. 
In the drawings of the wings I have endeavoured to give 
the relative proportions as accurately as possible; but should 
I have failed therein it is not of much moment, as the course 
of all the nervures is correctly indicated, and thus a com- 
