FORMOSAX AGROMYZIDAE. 325 



Female : Similar to the male in color etc. The ovipositor is 

 highly glossy, and ])rotrudes as far as the length of the last abdominal 

 segment. As in the male, the frontal triangle does not reach beyond 

 middle of frons, and is acute at apex. The eyes are only slightly 

 pubescent. 



Allotype: Tainan, April, 191-2. 



Paratypes: Yentempo, Chip-Chip, Tapani and Toycnmongai. 



17. Agromyza producta n. sp. 



Male: Black, distinctly shining. Frons opaque, orbits and frontal 

 triangle glossy ; antennae, arista, face, cheeks, palpi, and proboscis black. 

 Mesonotum with a slight bluish, or greenish, luster. Abdomen glossy black, 

 dorsum with a bluish luster at base, becoming violaceous on apical half; 

 hypopygium black. Wings clear, veins fine, black. Squamae whitish, fringe 

 -concolorous. Halteres brown-black. 



Frons slightly over one third the width of head, but little convergent 

 anteriorly; triangle very distinct, elongated, the apex acute, reaching to 

 well beyond the middle; orbits narrow, distinct, each about one fourth 

 a.s wide as center stripe ; 4 pairs of orbital bristles present, the upper about 

 •equal in length to one third the eye height, the others slightly decreasing 

 in size anteriorly, no distinguishable orbital hairs present ; antennae inserted 

 slightly below middle of profile, second joint with short, but distinct, dor- 

 sal bristle, third joint small, rounded; arista bare, but little swollen at 

 base, as long as from its base to between the 2 upper orbital bristles ; cheek 

 about one fourth the height of eye, anterior angle distinctly produced, 

 marginal hairs weak, vibrissa stout, but not long. Mesonotum with 2 pairs 

 of strong dorso-centrals ; discal setulae short, hair-like, very closely placed. 

 Abdomen broadly ovate, surface with numerous short hairs; hypopygium 

 normal. Legs rather slender; mid tibia with the posterior pair of bristles 

 weak and widely separated. Wings normal in shape: inner cross vein at 

 just beyond end of first vein and distinctly, though not greatly, beyond 

 middle of discal cell; last section of fourth vein about 5 times as long as 

 penultimate section; last sections of veins 3 and 4 subparallel; last section 

 of fifth vein two thirds the length of penultimate section. 



Length: 1*5 mm. 



Type: Pilam, August, 1912. 



Female: Similar to the male in color and size. Ovipositor highly 

 glossy, much protruded, tapering, circular in cross section; wings broader 

 than in the male, the inner cross vein more distinctly beyond the middle 



