FORMOSAN AGROMYZIDAE. 
819 
latter situated on near to the eye margin; antennæ normal in size, the 
upper surface of the basal joint at just about the middle of profile, 
second joint with a short apical bristle on the dorsum, third joint slightly 
elongate, apex rounded, pilosity very short ; arista very little thickened 
at base, pubescence very short, length of arista slightly short of from 
its base to the base of upper orbital bristle; face concave in profile; 
cheek linear, not over one tenth the height of the eye, margin with 
slight hairs, the vibrissa slightly differentiated. Mesonotum with 4 pairs 
of dorso-centrals, the two anterior pairs distinctly reduced in size; discal 
setulæ numerous, about 8 rather irregular rows between the anterior 
dorso-centrals ; the pair of bristles between the posterior dorso-centrals 
distinct. Abdomen ovate, the surface hairy ; ovipositor short and broad. Legs 
stout ; the two bristles on the mid tibia strong. Wings slightly elongate, 
wenation as fig. 14. 
Length: 8‘5 mm. 
Locality : Chip-Chip. One specimen, March. 
9. Agromyza niveipennis n. sp. 
Male: Black, slightly shining. Frons opaque, brown-black, the orbits 
subopaque; face brownish; palpi and proboscis black. Squamæ and the 
fringes yellowish-white. Legs black, fore tibiæ and the bases of all the tarsi 
brownish yellow. Wings whitish, the veins vitreous, with the exception of 
the costa, which is brown. Halteres yellow, knob whitish. 
Head rather large, the frons slightly buccate, the face slightly retreat¬ 
ing; width of frons one third that of head, orbits distinct, each about 
equal to one third the width of the central stripe, six pairs of orbital bristles 
present, which are situated on near to the inner margin, and decrease 
sligthly in length anteriorly, the orbits otherwise almost bare; antennæ 
of good size, third joint slightly acute at the apex on the upper side, arista 
about 2y 2 times as long as the third joint of the antennæ, almost bare, and 
very thin except at the base ; cheek linear at the anterior margin, becoming 
about twice as high at the posterior margin, where it is not more than one 
sixth the height of the eye, marginal bristles distinct, the vibrissa weakly 
differentiated. Mesonotum with 2 strong and 1 weak pairs of dorso-centrals, 
the pair of bristles between the posterior pair of dorso-centrals strong ; 
discal setulæ numerous, and in the line of the dorso-centrals rather strong. 
Abdomen broadly ovate ; hypopygium very similar to that of parvicornis 
Loew. Legs strong, the mid tibia with the posterior bristles distinct. Wing 
with the inner cross vein at the middle of the discal cell; the last section 
of the fourth vein about 2% times as long as the penultimate section, 
