VI BULLETIN 190, UNITED STATES NATIONAL MUSEUM 



Page 



The Bembecia group 191 



Genus Bembecia Hiibner 191 



Key to North American species of Bembecia 192 



The Zenodoxus group 194 



Genus Zenodoxus Grote and Robinson 194 



Explanation of plates 202 



Index to genera, species, and lower categories 209 



Food-plant index 214 



