AGROMYZID LEAF MUSTERS — FRICK 361 



5. Costa reaching to the end of vein M1+2; mesonotum without a green sheen 



and bearing two dorsocentrals angelicae 



Costa reaching to the end of R4+B; mesonotum with a green sheen and bearing 

 three dorsocentrals tamia 



6. Calypter with margin and fringe white or yellowish 7 



Calypter with margin and fringe dark brown 15 



7. Mesonotum and abdomen with a bronzy or greenish metallic sheen ... 8 

 Mesonotum and abdomen without a metallic sheen 12 



8. Foretibia medially without a strong posterolateral seta 9 



Foretibia medially with a strong posterolateral seta caerulea 



9. Mesonotum and abdomen with both bronzy and greenish sheen; crossvein 



m-m more than its length from r-m 10 



Mesonotum and abdomen with greenish sheen only; m-m not more than its 

 length from r-m 11 



10. Eye setulose, especially on dorsal half; subcranial margin rounded from 



vibrissa to posterior angle (fig. 23) approximata 



Eye bare; subcranial margin straight from vibrissa to posterior angle (fig. 21). 



aldrichi 



11. Lunule very high, about as high above antennal bases as frontal vitta is long; 



frontal triangle reaching lunule viridis 



Lunule lower, about one-half as high as frontal vitta is long; frontal triangle 

 shorter, reaching to two-thirds of the distance to lunule .... gibsoni 



12. Costa reaching to the end of vein M1+2 13 



Costa reaching to the end of vein M4+5 winnemanae 



13. Head with three lower-orbital setae (figs. 35 and 39) 14 



Head with two lower-orbital setae (fig. 32) mallochi 



14. Vein M3+4 with penultimate section subequal to the ultimate . . . riparella 

 Vein M3+4 with penultimate section about twice as long as the ultimate. 



gubvirens 



15. Head, viewed in profile, with genovertical plates not extending beyond eye 



margin (fig. 31) 16 



Head, viewed in profile, with genovertical plates e.xtending beyond eye margin 

 (figs. 36 and 38) 20 



16. Mesonotum and abdomen without a metallic green sheen 17 



Mesonotum and abdomen with a metallic green sheen minima 



17. Lunule and ventral half of frontal vitta black to very dark brown .... 18 

 Lunule and ventral half of frontal vitta reddish diadema 



18. Midtibia medially with at least one posterolateral seta 19 



Midtibia medially without a posterolateral seta crotonis 



19. Foretibia mediallj' without a posterolateral seta; midtibia medially with 



three posterolateral setae longiseta 



Foretibia medially with a posterolateral seta; midtibi?- medially with one 

 posterolateral seta orbitalis 



20. Costa reaching to or slightly beyond the end of R4+5 21 



Costa reaching to the end of M1+2 23 



21. Mesonotum with two strong dorsocentrals 22 



Mesonotum with three strong dorsocentrals salicis 



22. Genovertical plates dull; anterior half of mesonotum with acrostichal setae 



in six to eight rows similala 



Genovertical plates shining; anterior half of mesonotum with acrostichal 

 setae in eight to ten rows simplex 



23. Head with two or three lower-orbital setae 24 



Head with four or five lower-orbital setae (fig. 37) setifrons 



