Acknowledgements 



The western species were made available for study by Dr . D. 

 G. Denning, Moraga, California. The illustrations were made by 

 Miss Wendy Lull, a graduate student in the Zoology Department, 

 University of New Hampshire. The keys have been adapted from 

 those of previous workers. The illustrations have been redrawn 

 from published figures of the type description, if possible, or 

 from other appropriate sources. The works of Betten (1934) and 

 Ross (1944) were invaluable in the present study. 



Programs of the New Hampshire Agricultural Experiment Station are 

 open to all persons without regard to race, color, national origin or 

 sex. The University of New Hampshire is an Affirmative Action/Equal 

 Opportunity Employer. 



