SYRPHID^E, 



237 



SYRPHHLE. 



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



subapical areolet< 



I. gradually widened from the base outwards 2. CALLICERA. 



'bisected transversely 3. MICRODON. 



'meeting before they reach the f covered by the alulae 5. ERISTALIS. 



margin: halter es< 



(.uncovered 13. VOLUCELLA. 



feathered 14. SERICOMYIA. 



as long as the breadth of f near the middle of the third joint . . .16. 



the head : arista< 



[near the base of the third joint . . .15. 



is 



2 S 



3 



descending straight 4. 



impressed 10. 



keeled : ridge f angular 8. 



under hind femoral 

 I 



PSARUS. 



CHRYSOTOXUM. 



EDMERUS. 

 XYLOTA. 

 TROPIDIA. 

 SYRITTA. 



* i'i 



curved 9. 



6. HELOPHILUS. 



narrowed in the f elongated and tuberculated 

 middle: epistoma< 



1. short and even ..... 7. 



shaggy with soft hair ...... 12. 



( 



1 1 . 



;=5\i5 "Q / merely pubescent 



l-sJi.3 i 



c ~Z -5 o with stiff bristles interspersed among 



the pubescence 24. 



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

 descending straight 19. 



17. 



S . 



close together at the base : ["undulated . . 

 lower transverse vein< 



(^straight 18. 



diverging f somewhat convex ; margin undefined 22. 



from the I 



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



margin : I edge : third joint < 



scutellum L of antennae (_oval or orbiculate 21. 





1 1. 2 



CRIORHINA. 

 MILESIA. 



ClIRYSOCLAMIS. 



RHINGIA. 



PIPIZA. 



PARAGUS. 



PSILOTA. 



BRACHYOPA. 

 ORTHONEUBA. 

 CHRYSOGASTEK. 

 MELITHREPTUS, 



|- with seven segments apparent . . . .28 



"pitted or channelled . . . .25. CHILOSIA. 



'to ."^ 



L 



Sf3 



it 



26. SYRPIIUS. 



even, convex: (^maculate 

 sides of thorax< 



I. variegated with 



yellow . . 27. Douos. 



indistinct : 



r slender like the others 2Q. BACCHA. 



hindfemora< 



f rounded at the tip behind 



30. SPHEGINA. 



V. enlarged: subapical areoletl 



Ltruncated 31. ASCI A. 



