SYRPHID^. 



23 



SYRPHIDiE. 



r abruptly narrowed in the middle 1. 



with a terminal style : 



subajjical (ireoleti 



t gradually widened from the base outwards 2. 



bisected transversely 3. 



meeting before they reach the f covered by the alulee 5. 



margin: hallKresi 



I, uncovered 13. 



feathered 14. 



. 16. 



I 



-(.S 



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



the head: arista < 



(.near the base of the third joint 



Ceria. 



Callicera. 



MiCKonoN. 



Eristalis. 



volucella. 



Sericomyia. 



PSARDS. 



Chrysotoxum 





'descending straight 4. 



impressed lo. 



keeled : ridge 

 under ' 



fnarrowed in the 

 middle : ep 



idge ("angular . . 



hind femoriii. 



L curved . . 



the f 

 istoma < 





J > 3 



elongated and tubcrculated . 6. 



short and even 7. 



shaggy with soft hair 12. 



merely pubescent 11. 



c Ji 



5= a 



:=;-i SJ'O 



"rt clJ-S c I with stiff bristles interspersed amons^ 

 % * Ltl-a'S oS the pubescence 24. 



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



■ descending straight 19. 



'close together at the base : ("undulated 



lower transverse vein-^ 



^straight 



diverging f somewhat convex ; margin undefined 22. 



from the J 



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



margin : edge : third joiiit< 



scutellum L 0/ aM<e«7jffl j^oval or orbiculate 21. 





ECMERUS. 



Xylota. 



Tropidia. 



Syritta. 



Helopiulus. 



JIerodon. 



Criorhin.a. 



MlLESIA. 



Chrysoclami 

 Khingia. 



PiPIZA. 



Paragus. 



PSILOTA. 



Bracqyopa. 

 Orthoneuba. 

 Chrysogastei 

 Melithreptu 



with seven segments apparent . . . 



3 f pitted or channelled . . . . 25. Chilosia 





cS ij C '^ P 



even, convex: [immaculate . 26. Syrphus. 

 sides of IhoraJri 



Lvariegated with 



yellow . . 27. UoKOS. 



indistinct : 



{slender like the others 29 

 frounded at the tip behind .... 30, 

 enlarged: suhupical areoleti 



Ltruncated 31 < 



Baccha. 

 spuegina. 



ASCIA 



