VI 



eventually adopted^ and it may often happen that all the species 

 following such generic names would not be considered by the 

 Author who proposed the name as belonging to his group^ but 

 the one immediately following is always a typical species : it will 

 also be observed that the species in such cases are left with ter- 

 minations agreeing with the first generic name^ as in Borborus. 



As it is only by collecting diligently^ exchanging liberally and 

 pm'chasing judiciously that a good Collection can be formed^ 

 the Author invites Entomologists to send those insects which 

 are desiderata to him with a marked Guide^ and he will be happy 

 to make the best return in his power.' This request is not made 

 merely that he may possess as far as possible all the British In- 

 sectsj but as his Cabinets have been open for the last 13 years 

 to his friends on Wednesdays^ it will be of advantage to many 

 of the most zealous Naturalists engaged in the Science, and he 

 will willingly give 50^. per 100 for British examples of those 

 species he does not possess, or at the same rate for any smaller 

 number. 



It is gratifying to the Author to return his best thanks to Mr. 

 Dale, Mr. Haliday, Mr. Walker, and other friends for their 

 kind assistance in rendering this Guide more complete than it 

 otherwise could possibly have been. 



57, Upper Charlotte Street, 

 Fitzroy Square, 

 June, 1837. 



Just Published, 



By Mr. Andrew Pritchard, a List of 2000 Microscopic Objects, with Remarks and 

 a List of all Plants in which the circulation is visible under a Microscope, forming a 

 Guide for selecting microscopic sul:)jects from the Animal and Vegetable Kingdoms. 

 It is also adapted for labelhng the objects. 



