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 Formicidce 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 

 decree, the difficulties presented by this list, I have added 

 some notes in elucidation of it. 



