Exchan(j:es and Determinations 



Thysanoptcra and Psyllidac of the two Americas, including many cotypcs 

 to exchange for material in these groups from any part of the world. Prompt 

 determinations of new collections made on request. 



D. L. Cr.vwford, Pomona College, Claremont, California. 



Prosopidac of Xorth .Xiiicrica and Collctcs of Mexico tn cxchanjio for 

 species not in my collection. Prompt determinations of western and south- 

 western material made on request. Also named Californian Noctuidae — some 

 new — to exchange for West Coast species not in my collection. 



C. W Mi:tz. Pomona Colle'.^'e. Claremont. California. 



Named Coccidac, Aphididae. and CoccincUidae of California to exchange 

 for named species of these groups from other regions. 



E. O. Essie, Horticultural Commissioner, Santa Paula. California. 



Named Californian Acarina (Mites and Ticks'), mounted on slides, for 

 similar material from other parts of the world. 



II. Y. M. H.M.I.. Pomona C<illege. Claremont. California. 



Alcocharinac ( Staphylinidae) of the world. Will buy and exchange. 

 Dr. .\. Fi;nvi:s. P.ox W. Pasadena. California. 



Wanted by exchange, Moths, from the Western States, especially 

 Noctuidae. Will endeavor to determine species sent for names. Will name 

 any North American butterflies for privilege of retaining a set. 



F. Criwfi I , Ir . >72 N. Marcncro Ave.. Pasadena. Californi.i 



Fine named .\merican Cicadidae to exchange for Cieadidae from any 

 part of the world. 



Named Californian and Mexican Diplcra and Orthoptera (.some new") to 

 exchange for desiderata in these groups from other Western Stales or from 

 Mexico, Central or South .-Vmerica. 



Also named Californian and Mexican Coleoptcra to exchange for named 

 Southwestern or Mexican Coccinellidae, Scarahaeidae, Ceramhycidae. or 

 Rhynchophara. 



C. F. B.VKEK, Pomona College. Claremont, California. 



