4 PREFACE. 



The name of the author of the species, and not of the genus, is given 

 as authority; and in order to indicate whether or not the insect was 

 originally described under the generic name which it bears, I have 

 adopted, for the first time, the following plan: When the specific 

 name is coupled with the generic name under which it was first pub- 

 lished, the describer's name is attached without a comma — thus indi- 

 cating the authorship of the dual name : e. g. PJiycita nebulo Walsh. 

 But when a diiferent generic name is employed than that under which 

 the insect was first described, the authorship is inclosed in parenthesis, 

 thus — Acrohasls nehulo (Walsh); except where the whole name is 

 already in parenthesis, when a comma will be used for the same pur- 

 pose : e. g. {Acrohasis nehulo^ Walsh). 



My office is still at Room 29, Insurance Building, south-east corner 

 of Fifth and Olive streets, St. Louis; where all communications should 

 be sent. 



My thanks are due to many friends, but more especially to Mr. 

 Otto Lugger and Miss Mary E. Murtfeldt, who have aided me in ex- 

 periments, and assisted in other ways during my absence from home. 



I also thankfully acknowledge the receipt of free passes over the 

 following railroads: St. Louis and Iron Mountain, Missouri Pacific, 

 Atlantic and Pacific, Hannibal and St. Joseph, North Missouri, Chicago 

 and St. Louis, and Illinois Central. 



Respectfully yours, 



CHARLES Y. RILEY, 



State Entomologist. 



St. Louis, Mo., December 2, 1872. 



