FORMOSAN AGROM YZÏD AE. 
829 
not one-eighth as high as eye; marginal hairs numerous; vibrissa well 
differentiated. Mesonotum, abdomen, and legs as in variihalterata. Wing 
with the inner cross vein at middle of discal cell and at below end of first 
vein; last section of fourth vein 8 y 2 times as long as penultimate section; 
last sections of veins 8 and 4 subparallel; last section of fifth vein over 
two thirds as long as penultimate section. 
Length: 3—8*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. 
23. Agromyza variihalterata n. sp. 
Male: Glossy black. Frons, including the triangle, opaque black, 
the orbits glossy; lunule white pollinose; face and cheeks opaque black; 
apex of proboscis yellowish. Mesonotum and pleuræ with slight brownish 
pollinosity. Abdomen with a slight indication of a greenish luster. Legs 
subopaque black. Wings clear, veins black. Squamæ 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, 
which decrease slightly in strength anteriorly, the anterior pair incurved, 
orbits otherwise bare; frontal triangle not discernable; antennæ 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 setulæ are not carried as far 
posteriorly. Abdomen ovate ; lamellae 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 2% times as long as penultimate 
section ; last sections of veins 8 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. 
