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Exchange F 



A large number of duplicates of North American 

 Lepidoptera which have accumulated in the Barnes Collec- 

 tion, including many species from the West and Southwest, 

 are offered in exchange for series of bred specimens, even 

 of the commoner species, or for species from North America 

 not in the collection. Desiderata List sent on application. 



Identification of N. American material will be gladly- 

 undertaken for the privilege of retaining desired specimens. 



In connection with the proposed publication of a full 

 Catalogue of N. Americayi Lepidoptera records of captures 

 are much desired in order to establish the geographical 

 range of each species ; also data regarding the location of 

 type specimens will be gladly received. 



Dr. Wm. Barnes, Decatur, III. 



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