FORMOSAN AGROMYZIDAE. 
813 
7. Frons clear lemon yellow ; last section of fifth vein at most as long as penul¬ 
timate section; generally shorter. 6. longipennis Loew, var. nigricoxa m var. 
— Frons brownish; last section of fifth vein distinctly longer than penultimate 
section..7. brunnifrons n. sp. 
8. Apices of femora and bases of tibiæ, narrowly, but conspicuously yellow, 
contrasting with the other parts of the legs, which are brownish black. 
7. brunnifrons n. sp. 
— Legs unicolorous black, or at least with the knees not conspicuously yellow. . 9. 
9. Halteres entirely yellow.10. 
— Halteres at least partly black.16. 
10. Squamae yellow, or whitish, the fringe pale....11. 
— Squamae brownish, the fringe concolorous.12. 
11. Mesonotum with 4 pairs of dorso-cen trais. . 8. flavisquama n. sp. 
— Two strong and one weak pairs of dorso-centrals on the mesonotum. .. 13. 
12. Wings whitish, veins almost colorless; 6 pairs of bristles on the orbits. 
9. niveipennis n. sp. 
— Wings hyaline, veins distinct; 5 pairs of orbitals.10. plebeia n. sp. 
13. Penultimate section of the fifth vein distinctly shorter than the last section ; 
legs entirely black.11. atrata n. sp. 
— Penultimate section of fifth vein distinctly longer than the last section ; tarsi 
yellowish..14. 
14. Small species, 15 mm; wings short and broad.12. latipennis n. sp. 
— Larger species, 2 mm. and over, wings normal.15. 
15. Tarsi black; inner cross vein at very distinctly before the middle of the discal 
cell, and before the end of first vein.13. koshunensis n. sp. 
— Tarsi yellowish; inner cross vein at slightly before the middle of discal cell, 
and just below the end of first vein.14. obesa n. sp. 
16. Squamae white or yellow, fringe pale... 17. 
— Squamae blackish or brownish, fringe dark.21. 
17. Frontal triangle very broad, extending to lunule, metallic greenish black, 
at middle of frons occupying over one half the width of center stripe; eyes 
of male distinctly hairy on an area above, most readily seen from the side. 
15. obtusa n. sp. 
— Frontal triangle not very broad, with an acute apex, the sides rapidly con¬ 
verging anteriorly.18. 
18. Large species, averaging over 3 mm; eyes of male distinctly hairy above, 
those of the female slightly pubescent. 16. lasiops n. sp. 
— Smaller species, averaging about 2’5 mm ; eyes of male not hairy.19. 
19. Mouth margin slightly produced; upper margin of basal joint of antenna at 
below the level of the middle of the eyes ; inner cross vein at distinctly beyond 
the middle of the discal cell.17. producta n. sp. 
— Species without the above combination of characters .20. 
20. Arista covered with dense pubescence which is at least twice as long as the 
basal diameter of the arista; cheek linear.18. piliseta n. sp. 
