FORMOSAN AOROMYZIDAE. 
335 
weak; discal setulæ weak, about 8 irregular rows between anterior dorso- 
centrals. Abdomen ovate; ovipositor stout. Legs slender; tibiæ without 
setulæ. Second costal division iy 2 times as long as first; third, one-third as 
long as first ; apex of costa at end of third vein and as far from apex of wing, 
measuring round the margin of wing, as the length of first costal division; 
fourth vein ending at wing tip. 
Length: L25 mm. 
Type: Tainan, May, 1912. 
Paratype: Takao, April 23, 1907. 
Phytomyza subaffinis n. sp. 
Female: Black. Head yellow; ocellar region, antennæ, and arista black; 
palpi brownish. Entire thorax densely covered with gray pollen. Abdomen 
glossy black with the dorsum slightly gray dusted, and the posterior margins 
of the segments narrowly yellow. Legs black, knees narrowly yellow. Wings 
slightly grayish, veins distinct, brownish, fourth slightly less conspicuous than 
fifth, first and third very distinct, though not thickened. Squamæ and their 
fringes grayish. Halteres pale yellow. 
Frons two-fifths the head width; orbits distinct, each about one 
half as wide as center stripe ; three pairs of orbitals present, which decrease 
in length anteriorly, and in addition to these there are a few hairs 
nearer to the eye margin; antennæ of moderate size, third joint rounded; 
arista thickened, tapering to sligthly beyond middle, bare, its length equal 
to that of frons; cheek one-third as high as eye, marginal hairs distinct, 
vibrissa well differentiated. Mesonotum with 4 pairs of strong dorso-centrals, 
which do not decrease much in length anteriorly ; disc between the dorso- 
centrals bare, or rarely with one or two scattered setulæ; no bristles 
between the posterior dorso-centrals. Abdomen elongate, surface with a 
few short hairs; ovipositor stout, as long as the last segment. Legs slender; 
tibiæ unarmed. Wings more elongate than in spicata, but the costal divi¬ 
sions similar. 
Length: P75—2*5 mm. 
Type: Chip-Chip, February. 
Paratypes: Taihoku, April, 1912; Chip-Chip, February, 1912, 3 spe¬ 
cimens; Tainan, February. 
Male: Similar to the female in color and chætotaxy. The hypopygium 
is large and rather prominent, its form very similar to that of the species 
in Agromyza. 
Allotype : Tainan, February. 
