Exchanges and Determinations 



Thysanoptcra and Psyllidac of the two Americas, including many cotypcs 

 to exchange for material in these groups from any part of tiie worhl. Prompt 

 determinations of new collections made on request. 



D. L. Cr AwroRn, Pomona College. Claremnut, California. 



Prosopidac of North .\mcrica and CoUvtes of Me.xico to e.\changc for 

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

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

 new — to exchange for West Coast sj>ecies not in my collection. 



C. W. Mi:tz, Pomona College, Claremont, Californi.i 



Named Coccidac. Aphididae. and Coccincllidac of California to exchange 

 for named species of these groups from other regions. 



E. O. Essir,, Horticultural Commissioner, Santa Paida. California. 



Named L'aliforiiian Acaniia (.Mites and Ticks), mounted on sliilcs, for 

 similar material froin other parts of the world. 



TI \'. M. TIai.i.. Pomona College, Claremont, California. 



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

 Pk. .\. FenyKS, Box W, Pasadena, California. 



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

 Noctuidac. Will endeavor to determine species sent for names. Will n.ime 

 any North American butterflies for privilege of retaining a set. 



F. Grin NELL. Jr., 572 N. Marengo .'\ve., Pasadena, California. 



Fine named .Xmerican Cicadidae to exchange for Cicadidae from any 

 part of the world. 



Named Californian and Mexican Dipicra and Orthoptcra (some new) to 

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

 Mexico, Central or South America. 



Also named Californian and Mexican Coleoplera to exchange for named 

 Southwestern or Mexican Cocciuellidae, Scarabacidac. Cerambyeidae, or 

 Rhynchophora. 



C. F. P.AKKR. Pomona College. Claremont. California. 



