CONTENTS. 



Class Hexapoda, 0rd6r COLEOPTERA. 



The Distinctive Characters of the Eastern Species of the Genera Dytiscus and 



Cybister. By C. H. Roberts 103 



Class Hexapoda, Order DIPTERA. 



Brief Notes on Mosquitoes. By H. G. Dyar 107 



Class Hexapoda, Order LEPIDOPTERA. 



Sound Produced by Lepidopterous Larvae. By H. Feukri.ey 109 



A Review of the Hesperiidae of the United States. By H. (1. Dyar Ill 



Class Hexapoda. Order HEMIPTERA. 

 The Genus Notonecta in America North of Mexico. By J. R. de.lA T. BOeno . . 143 

 Proceedings of the Society 167 



JOU RN A Iv 



Jlefct* J|orrk ffintormcdcr^ic&i Jig code tg* 



Published quarterly by the Society at 41 North Queen St., Lancaster, 

 Pa. , and New York City. All communications relating to the Journal 

 should be sent to the editor, Dr, Harrison G. Dyar, U. S. National Mu- 

 seum, Washington, D. C; all subscriptions to the Treasurer, Wm. T. Davis, 

 46 Stuyvesant Place, New Brighton, States Is., New York, and all books 

 and pamphlets to the Librarian, C. Schaeffer, Museum, Eastern Parkway, 

 Brooklyn, N. Y. Terms for subscription, #2.00 per year, strictly in ad- 

 vance. Please make all checks, money-orders, or drafts payable to 

 NEW YORK ENTOMOLOGICAL SOCIETY. 



Authors of each contribution to the Journal shall be entitled to 25 

 separates of such contribution without change of form. If a larger number 

 be desired they will be supplied at cost provided notice is sent to the 

 Editor befo e the page proof has been corrected. 



