Dec, I92I Bulletin of the Brooklyn Entomological Society 125 



8. Scutellum unusually large, nearly quadrate; males dichop- 



tic ; face concave Chalcomyia. 



Scutellum normal ; males holoptic ; face concave in the fe- 

 males, tuberculate in males Myiolepta. 



9. Body clothed with scattered, yellowish-white, scale-like ap- 



prqssed pile; face with a broad yellow stripe on each 



side Eufyiyiolepta, new genus. 



Pile of normal structure 10. 



10. Epistoma produced into a long porrect snout; costal vein 



continued well beyond apex of wing; the usual hairs on 



the base of the costa reduced to minute spines . . Rhingia. 



Epistoma not produced snout-like, etc 11. 



11. Thorax bearing distinct bristles; arista plumose 12. 



Thorax not bearing differentiated bristles; arista bare . . 13. 



12. Color largely black, face and sometimes humeri and scutel- 



lum more or less yellow ; general shape of head broadly 

 oval, (Females of several species of Chilosia.) 



Color ferruginous ; head triangular .... Hammerschmidtia. 



\ 



13. Antennae placed below middle of head ; costa ending at or 



slightly beyond tip of wing Brachyopa. 



Antennae placed above middle of head; costa ends before 

 reaching tip of wing . . (Cynorrhina pictipes and nigra.) 



14. Third antennal joint greatly enlarged. (Pelecocerini) . . 16. 

 Third antennal joint of normal size. (Spheginini) .... 15. 



15. Arista shorter than antennae; epistoma produced downwards, 



in profile gently concave Neoascia. 



Arista longer than antennae ; epistoma produced anteriorly, 

 face in profile deeply concave Sphegina. 



16. Antenna with dorsal arista Chameosyrphus. 



Antenna with terminal style Pelecocera. 



SERICOMYIN^, new subfamily. 



The Sericomyinae, at first glance, form a rather heterogeneous 

 group. However the long plumose arista and the unequal de- 

 velopment of the posterior claspers of the genitalia indicate a 

 mutual relationship. Due to the heterogeneous characters of 



