88 
HYMENOPTERA. 
logue indicates new genera in this family, and several spe¬ 
cies enumerated in that list prove not to be British ; a revi¬ 
sion of the list is therefore highly desirable. The difficulties 
attending the study of the Formicidcn have been removed by 
the publication of Dr. Nylander’s Monograph; the accuracy 
and acumen exhibited in this work will be acknowledged and 
appreciated by every lover of the science, who will see, in 
the lucid elaboration of the species, a master-hand, whose 
work commands our admiration. 
In Stephens's Systematic Catalogue of British Insects 
many' new species are enumerated, which, not having been 
subsequently described by the author, must have excited 
much speculation in the minds of Hymenopterists as to 
which species they may possibly represent; in some genera, 
the number of new species exceeds the total number at pre¬ 
sent known. Having the means of clearing up, in a great 
degree, the difficulties presented by this list, I have added 
some notes in elucidation of it. 
