FORMOSAN AGROMYZIDAE. 
381 
pubescent, its entire length about equal to 4 times that of antenna, and 
nearly twice as long as width of frons at anterior margin; cheek about 
one sixth as high as eye, marginal hairs rather strong, upcurved above, 
vibrissa differentiated ; face almost straight. Mesonotum with 2 pairs of 
dorso-centrals, the anterior pair weaker than the posterior pair; discal 
setulæ weaker than in Sauteri, and carried almost to the posterior margin 
of disc. Abdomen broader than in Sauteri. Legs strong; mid tibia with the 
posterior setulæ weak. Inner cross vein at below end of first vein and at 
middle of discal cell ; last section of fourth vein Sy 2 times as long as penul¬ 
timate section; veins 3 and 4 slightly divergent at apices; last section of 
fifth vein very slightly shorter than penultimate section ; sixth vein reaching 
over three fourths to wing margin. 
Length : 2*5 mm. 
Type: Pilam, August, 1912. 
A single example from Tainan, April, 1912, in which the outer cross 
vein is absent on one wing, appears to belong to this species. 
26. Agromyza atomella n. sp. 
Male: Glossy black. Frontal stripe opaque. Squamæ brown, fringe 
blackish. Wings clear, veins black. 
Frons one-third the width of head, convergent anteriorly; orbits 
distinct, narrow, 4 pairs of orbitals present, the upper 2 pairs moderately 
strong, the lower 2 pairs weaker, incurved ; hairs on orbits weak ; frontal 
triangle broad, reaching to middle of frons ; antennæ normal in size ; arista 
as long as length of frons; cheek about one sixth as high as eye, marginal 
hairs weak, vibrissa slightly differentiated. Mesonotum with 2 strong pairs 
of dorso-centrals ; discal setulæ of moderate strength. Abdomen broadly 
ovate. Mid tibiæ with the posterior setulæ weak. Inner cross vein at one 
third from apex of discal cell and at slightly beyond end of first vein ; veins 
3 and 4 subparallel on apical sections ; last section of fifth vein about three 
fourths as long as penultimate section. 
Length: 1 — 1*75 mm. 
Type: Pilam, August, 1912. 
Paratypes : Tainan ; Takao ; Pilam ; Anping. Twenty specimens. 
This species is variable in the situation of the cross vein, and the 
course of the third and fourth veins, which are sometimes divergent on 
their apical sections. 
