120 Bulletin of the Brooklyn Entomological Society Vol. XVI 



Allied to S. lugens Erichson, but differing from that in many- 

 details of structure aside from its much greater size. The prin- 

 cipal distinguishing characters are the longer elytral striae, the 

 less extensive punctate area of elytra, the much more polished 

 surface and strongly carinate pygidium. The pronotum is very 

 deeply impressed each side near apical angles. 



A RECLASSIFICATION OF THE SUBFAMILIES AND GEN- 

 ERA OF THE NORTH AMERICAN SYRPHIDAE. 



By Raymond C. Shannon, Bureau of Entomology. 



(Published by permission of Chief of Bureau of Entomology.) 



(Continued from p. 72.) 



The Syrphinae are the most important group, economically, of 

 the Syrphidae ; also the one most in need of thorough revision. 

 In the course of a revision of this "group the first splitting of the 

 genera may have to be made on the character of the beading of 

 the lateral margins of the abdomen. The genus Chrysotoxum 

 illustrates this character best. However, it will be only by a care- 

 ful consideration of the species that better definitions for the 

 genera will be arrived at. 



Table of Tribes and Genera of Syrphin^. 



I. Face and scutellum entirely aeneous or black; lateral margin 

 of abdomen never beaded ; costa ending at or slightly be- 

 yond tip of wing Tribe Melanostomini 2} 



Face, or scutellum, usually both, at least in part yellow f 

 lateral margins of abdomen more or less beaded (except 

 in Baccha, Paragus, Allograpta and about one half. the 

 species of Syrphus) ; costa frequently ending before tip 

 of wing, more rarely at or beyond 4. 



^ Contains feebly characterized genera. 



^ Certain species of Syrphus, S. macularis for example, may 

 be confused with Melanostomini because of blackish face and 

 scutellum. 



