From his own British Collection* being now named and ar- 

 ranged by the ^^ Guide/^ the Author has been enabled to make 

 the 2nd edition quite uniform with regard to Gravenhorst's Ich- 

 neumonidae^ of which a complete list is again given^ retaining his 

 numbers to the species^ so that it is an Index to his great Work. 



As this edition is necessarily increased in size^ from the great 

 addition of new genera and species^ it has been thought advisable 

 to omit as many synonyms as possible^ especially when they 

 have been already recorded in the ^^ British Entomology " or 

 other works^ and this will at the same time make the 1st Edition 

 of the Guide still useful for reference t ; and it was the more 

 necessary to adopt this plan in order to subjoin the Alphabetical 

 Index which must prove of essential service. 



It may be observed that the original numbers to the Genera have 

 been invariably retained^ so that unnecessary labour should not 

 be entailed on those who have employed the 1st Edition to label 

 their Cabinets^ he, and with few exceptions the old numbers 

 to the species remain also^ but where the genera have received 

 great additions^ as in Tachina for instance^ the numbers of 

 Meigen have been substituted^ by which means an easy reference 

 may be made to his valuable Work, 



It need scarcely be added that the generic and specific names 

 without numbers are considered as synonyms^ although many of 

 the former which intersect long genera will most probably be 



* Coataining 9500 species and 24,000 specimens. It may be useful to state 

 that the Coleoptera occupy 18 drawers ; the Bermaptera, Bictyoptera, Orthop- 

 tera and Strepsiptera 2 ; the Hymenoptera 20 ; the Neuroptera 5 ; the 2ri- 

 choptera 2 ; the Lepidoptera 30 ; the Homoptera, Hemiptera and Aphaniptera 

 3 ; and the Biptera and Omaloptera 15. Four Cabinets therefore of 24 or 25 

 drawers, 18 inches wide and 17 long, will hold all the British Insects, and any 

 one wishing to collect any portion only, is advised to purchase a good Cabinet 

 containing 24 drawers. 



t A few copies (price Qs,) of the 1st edition, wanting the order Coleoptera, 

 may be had by application to the Editor. 



