with the "Transactions of the American Entomological Society," of 

 Philadelphia, each part to contain one plate colored, with the appro- 

 priate letter press, and no pains will be spared to make the plates very 

 superior. As the letter press will partake very much of the character 

 of a compilation, I desire to acknowledge the valuable labors of my 

 predecessors in this field, and to return my sincere thanks to those 

 who have promised me their assistance, and in the appropriate place it 

 will be my pleasure to credit each individual with his respective work. 



RICHARD H. STRETCH. 

 San Francisco, June ist, 1872. 



