237 



SYRPHHXE. 



with a terminal style : f abruptly narrowed in the middle 1. CEBIA. 



I gradually widened from the base outwards 2. CALLICERA. 



... 3. MlCRODON. 



bisected transversely 



meeting before they reach the f covered by the alulae 



margin: halteres* 



\ uncovered 13. VOLCCELLA. 



as long as the breadth of f near the middle of the third joint 



the head : arista < 



I near the base of the third joint 



5. ERISTALJS. 



14. SEBICOMYIA. 

 16. PSABUS. 



15. CHBYSOTOXUM. 



8 r descending straight 4. EUMERUS. 



I impressed 10. XTLOTA. 



keeled: ridge ("angular 8. TEOPIDIA. 



under hind femora* 

 \_ [curved 9. SYRITTA. 



narrowed in the f elongated and tuberculated . 6. HELOPHILUS. 

 middle: epistoma< 



I, short and even J. MERODON. 



r shaggy with soft hair 12. CRIORHINA. 



J merely pubescent 11. MILESIA. 



if p. 1 



.2 o with stiff bristles interspersed among 



fs 5 * the pubescence 24. CHRYSOCLAMIS. 



drawn out into a horizontal cone, as long as the rest of the head 23. RHINGIA. 

 descending straight 19. PIPIZA. 



close together at the base : fundulated . . . .17. PARAGUS. 

 lower transverse vein< 



^straight 18. PSILOTA. 



diverging f somewhat convex ; margin undefined 22. BRACHYOPA. 



from the I 



posterior < flat, with a sharp ("linear . . . .20. ORTHONEUBA. 



margin : edge : third joint-i 



scutellum {, of antennas ^oval or orbiculate 21. CHRYSOGASTER. 



with seven segments apparent 



pitted or channelled 



28. MELITHREPTUS. 



. 25. CHILOSIA. 



even, convex: fimmaculate . 26. SYRPHUS. 

 sides of thorax < 



Lvariegated with 



yellow . .27. DOROS. 



f slender like the others 29. BACCHJ 



hindfemora< 



frounded at the tip behind . . . .30. SPHEGINA. 

 Unlarged : subapical areolet-i 



Ltruncated 31. ASCIA. 



