48 NORTH AMEKiCAN DIPTERA. 



C. Face produced eonically downwards ; antennae elongate. 



MYXOSARGUS Brauer. 



Face not produced eonically ; third antennal joint oval with a terminal 

 arista .. . . NOTIIOMYIA Loew. 



CLITELLARIN^E. 



1. Scutellum without spines. . ". . . t . ' . . . 7 

 Scutellum with spines. . 2 



2. Antennas short, witli a subterminal arista. . . OXYCERA Meigen. 

 Antennae more or less elongate 3 



3. Antennae situated near the oral margin ; third joint composed of six 



annuli (Central and South America). . EURYNEURA Schiner. 

 Antennae situated near or a little below the middle of the head in pro- 

 file. . . . . . . ... .... 4 



4. Antennae much elongated ; style not differentiated ; eyes bare ; smaller 



species . EUPARHYPHCS Gerstaecker. 



Antennae moderately elongated 5 



5. Style of antennae not differentiated. . . SCOLIOPELTA Williston. 

 Style of antennae distinctly differentiated 6 



6. Eyes pilose; antenna? with a slender style. CLITELLARIA Meigen. 

 Eyes bare; style not slender (Central America). 



AOCHLETUS Osten Sacken. 



7. Face eonically produced downward. . . NEMOTELUS Geoff roy. 

 Face not eonically produced. . . . . . . . 8 



8. Third antennal joint with a long slender arista, longer than the antenna? ; 



eyes bare (Central and South America and the West Indies). 



CHRYSOCHLORA Macquart. 



Eyes pilose; antennas with a short, thickened, divaricate, hairy style, ter- 

 minating in a short slender bristle; second joint of antennae not 

 with a finger-like projection over the third joint (West Indies). 



PELAOOMYIA Williston. 

 PACHYGASTKINvE. 



1. Antennae situated near the oral margin. . . . . 2 

 Antennae situated near the middle of the head in profile. . . 3 



2. Third joint of the antennae forked, complicated in structure (Chauna 



preoc. West Indies). . - . . . NKOCHAUNA, noni. nov. 



Third joint of the antennae elongate, with a distinct style, not forked 



(Central and South America). . . ACANTHINA Wiedemann. 



3. Scutellum ending in a stout spine (Central and South America). 



CYNIPIMOKPHA Brauer. 

 Scutellum without spine, simple. . . . PACIIYGASTER Meigen. 



