448 PROCEEDINGS OF THE NATIONAL MUSEUM 



Figures 1-20. — Agromyza and Napomyza species. The heads are shown in profile except 

 where noted. The soHd line equals 1 mm. 



Fig. 1. — Section of wing base of Agromyza amhigua Fallen, showing the manner in which the 



subcosta and Ri unite at the costa, greatly enlarged. 

 Fig. 2. — Section of wing base of Napomyza lateralis (Fallen), showing the manner in which 



the subcosta and Ri end separately in the costa, greatly enlarged. 

 Fig. 3. — Head of Agromyza ambigua Fallen (holotype 9 of A. kincaidi Malloch), dorsal 



upper-orbital and vertical setae missing. 

 Fig. 4. — Wing of A. aristata Malloch (holotype 9 of A. ulmi Frost), one-half size. 

 Fig. 5. — Head of holotype 9 of A. aristata Malloch. 

 Fig. 6. — Head of holotype c? of A. barberi Frick. 

 Fig. 7. — -Head of holotype 9 of A. canadensis Malloch. 

 Fig. 8. — Head of holotype 9 of A. currani Frost, one-half size. 

 Fig. 9. — Head of holotype cf of Agromyza frosti Frick, dorsal upper-orbital and vertical 



setae broken off. 

 Fig. 10. — Head of Agromyza inaequalis Malloch (holotype cf of A grainy za iridescens Frost), 



one-half size. 

 Fig. 11. — Head of holotype 9 of Agromyza isolata Malloch, dorsal upper-orbital and vertical 



setae missing. 

 Fig. 12. — Head of Agromyza nigripes Meigen (holotype 9 of Agromyza dubilata Malloch). 

 Fig. 13. — Head of holotype 9 of Agromyza pallidiseta Malloch. 

 Fig. 14. — Head of same, front view. 

 Fig. IS. — Head of Agromyza spiraeae Kaltenbach (holotype d^ of Agromyza fragariac 



Malloch). 

 Fig. 16. — Head of Agromyza subnigripes Malloch (holotype 9 of Agromyza aprilina Mal- 

 loch). 

 Fig. 17. — Wing of holotype 9 of Agromyza varifrons Coquillet, one-half size. 

 Fig. 18. — Head of same, front view. 

 Fig. 19. — Head of same, lateral view. 

 Fig. 20. — Head of holotype 9 of Agromyza viridula Coquilleit. 



