FORMOSAN AGROMYZIDAE. 329 



not one-eighth as high as eye; marginal hairs numerous; vibrissa well 

 differentiated. Mesonotum, abdomen, and legs as in variihalteraia. Wing 

 -with the inner cross vein at middle of discal cell and at below end of first 

 vein; last section of fourth vein 31/2 times as long as penultimate section; 

 last sections of veins 3 and 4 subparallel ; last section of fifth vein over 

 two thirds as long as penultimate section. 



Length: 3-3-75 mm. 



Type: Tainan, April, 1912. 



Paratypes: Tainan, May, 1912; Takao, 300 m., April 18, 1907, two 

 specimens; Koshun, September; Kankau, August, 1912. A female from 

 Takao, April, 1907, has the last sections of the third and fourth veins slightly 

 divergent, but in other respects agrees with the type. 



2;). Agromyza variihalterata n. sp. 



Male: Glossy black. Frons, hicluding the triangle, opaque black, 

 the orbits glossy; lunule white pollinose ; face and cheeks opaque black; 

 apex of proboscis yellowish. Mesonotum and pleurae with slight brownish 

 pollinosity. Abdomen with a slight indication of a greenish luster. Legs 

 subopaque black. Wings clear, veins black. Squamse grayish, margins and 

 fringe black. Halteres black, apex of knob whitish. 



Frons one third as wide as head ; orbits distinct, each about one third 

 as wide as center stripe, 4 pairs of moderate-sized orbital bristles present, 

 w^hich decrease slightly in strength anteriorly, the anterior pair incurved, 

 orbits otherwise bare; frontal triangle not discernable; antennge normal in 

 size, inserted below middle of profile, second joint with short dorsal bristle, 

 third joint rounded ; arista almost bare, tapering, almost as long as frons ; 

 cheek short and narrow, not more than one-eighth as high as eye, marginal 

 hairs distinct, vibrissa well differentiated. Mesonotum with 2 pairs of dorso- 

 centrals, otherwise as in aliena, except that the setulse are not carried as far 

 posteriorly. Abdomen ovate ; lamella of hypopygium elongated, their length 

 equal to that of the last abdominal segment ; hairs on abdomen not so con- 

 spicuous as in aliena. Legs rather slender; fore tibia with a setula on the 

 posterior surface at about the middle ; mid tibial bristles longer than in allied 

 species, the upper one being much longer than the diameter of the tibia. 

 Inner cross vein at before the end of first vein and at one third from base of 

 discal cell ; last section of fourth vein about 21/2 times as long as penultimate 

 section ; last sections of veins 3 and 4 gradually divergent ; last section of fifth 

 vein three fourths as long as penultimate section : auxiliary vein complete. 



Length: 2*75 mm. 



Type: Koshun, March. 



