ADVERTISEMENT. 



In the Smithsonian Report for 1858, a paper was published 

 on the method of collecting and preserving insects, prepared 

 by Baron Ostensacken, of the Russian Legation, with contri- 

 butions by other eminent entomologists, which has rendered 

 valuable service in the way of awakening an interest in Ento- 

 mology and in facilitating the collecting of specimens. It 

 was, however, not stereotyped, and as the methods of gather- 

 ing and preserving insects have been much improved since its 

 date, it has been thought advisable to request Dr. Packard, as 

 a leading authority, to furnish a new treatise on the same sub- 

 ject. In compliance with this request he has prepared the fol- 

 lowing pages, derived mainly from the "Guide to the Study of 

 Insects,"* though with some additions and corrections, corre- 

 sponding with the present state of our knowledge. 

 JOSEPH HENRY, 



Secretary Smithsonian Institution. 



Smithsonian Institution, 



Washington, September, 1873. 



* Published by the Naturalists' Agency, Salem, Mass. 8vo. 

 (ii) 



