FOKMOSAN AGROMYZIDAK. 313 



7. Frons clear leiiiuu yellcnv ; last section of fifth vein at most as long as penul- 

 timate section ; generally shorter. 6. longii^ennis Loew, var. nigricoxa n. var. 



— Frons brownish: last section of fifth vein distinctly longer than i)enultimate 

 section 7. brunnifrons n. sp. 



8. Apices of femora and bases of i'\\mv, narrowly, but conspicuously j^ellow, 

 contrasting with tlie other jiarts of the legs, which are brownish black. 



7. hvminifrons n. sp. 



— Legs unicoloious black, or at least with the knees not conspicuously yellow. . 9. 



9. Halteres entirely yellow 10. 



— Halteres at least partly black 16. 



10. Squanue yellow, or wliitish. the fi'inge ]>ale 11. 



— Squam* brownish, the fringe coucolorous 12. 



11. Mesonotuni with 4 pairs of dorso-centrals 8. fldvisquama n. sp. 



— Two strong and one weak pairs of dorso-centrals on the mesonotuni. . . 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. jAebeia 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, l"o mm; wings short and l)roa(l 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 slighth- before the middle of discal cell, 

 and just below the end of first vein 14. obesa n. S]i. 



16. Sciuamge white or yellow, fringe pale 17. 



— Squamse blackish or brownish, fringe dark 21. 



17. Frontal triangle very broad, extending to lunule, metallic greenish black, 

 at middle of frons occupying over one halt the width of center stripe; e3'es 

 of male distinctly hairy on an area alio^-e, most readilj" seen from the side. 



15. obfusa n. s]). 



— Frontal triangle not very broad, with an acute apex, the sides rapidly con- 

 verging anteriorly IS. 



18. Large species, averaging over 3 nan; 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 pi^bescence which is at least twice as long as the 

 basal diameter of the arista ; cheek linear 18. piliseta n. sp. 



