44 Syrphidae. 



with abdomen black on basal half, red on apical _ 



half 38. Cynorrhina. -> ^ ( 



6. Thorax without yellow markings, at all events on 



the disc 7. 



— Thorax with yellow markings on the disc 13. 



7. Hind femora more or less spinose beneath, or with 



a tooth-like process near apex 8. 



— Hind femora not spinose beneath, nor with any 



tooth 12. 



8. Epistoma more or less hoUowed below antennæ; 



upper marginal cross-vein not recurrent 9. 



— Epistoma not hol iowed below antennæ ; upper marginal ^ 

 cross-vein recurrent above 42. Eumerus. j ^j 



9. Hind femora evenly spinose beneath, without any 



tooth 10. 



— Hind femora with a large tooth or process beneath 



at tip 34. Tropidia. ^%0 



10. Epistoma somewhat carinate; hind femora very 



strongly thickened 41. Sijritta. o 2-^ 



— Epistoma not carinate; hind femora less thickened.... 11. 



11. Medial cross-vein before the middle of the discai 



cell 35. Myiolepta. Y ^U- 



— Medial cross-vein after or near the middle of the 



discai cell 40. Xylota. Sn } 



12. Thorax and scutellum with bristles 43. Ferdinandea. *^ Hl 



— Thorax and scutellum without bristles 38. Cynorrhina. ^fy \ 



13. Hind femora with a triangular tooth below near 

 apex; anal vein considerably prolonged beyond the 



apex of the anal cell 44. Spilomyia. iy^'^ 



— Hind femora without tooth; anal vein not prolonged _ 

 beyond the apex of the anal cell 45. Temnostoma.^ •§" 3 



14. Densely pilose species; abdomen without yellow 



bands 46. Arctophila. SS"^ 



— Thinly haired species; abdomen with yellow bands 47. Sericomyia. ^^-^__ 



V. Chrysotoxinae. 



Antennæ elongate, porrected ; arista dorsal (in the Danish genus), 

 bare. Frons hairy. Epistoma slightly hoUowed, with a small central 

 knob below, not much descending; it is black and yellow, hairy. 

 Eyes touching in the male. Subcostal cell open; medial cross-vein 

 before the middle of the discai cell; cubital vein curved evenly more 

 or less downwards ; no stigmatical cross-vein. 



The larvæ live in decaying vegetables; the pupæ have no anterior 

 spiracular tubes. 



Only one Danish genus 48. Chrysotoxum.. S^^ 



