Exchanges and Determinations 



Thysanoptera and Psyllidae of the two Americas, including many cotypes 

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

 determinations of new collections made on request. 



D. L. Crawford, Stanford University P. O., California. 



Wanted by purchase or exchange, pupae, cocoons or eggs of any Catocalae 

 of the West and South, especially California and Mexico. 



Joseph Sever, 335 E. 49th St., New York City.. 



Named Coccidae, Aphididae, and Coccinellidae of California to exchange 

 for named species of these groups from other regions. 



E. O. EssiG, Deputy Horticultural Commissioner, Sacramento, California. 



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

 similar material from other parts of the world. 



H. V. M. Hall, Pomona College, Claremont, California. 



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

 Dr. a. FenyES, Box 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. Grinnell, Jr., 572 N. Marengo Ave., Pasadena, California. 



Fine named American Cicadidae to exchange for Cicadidae from any 

 part of the world. 



Named Californian and Mexican Diptera and Orthoptera (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 Coleoptera to exchange for named 

 Southwestern or Mexican Coccinellidae, Scarabaeidae, Cerambycidae, or 

 Rhynchophora. 



C. F. Baker, Pomona College, Claremont, California. 



