FOKMOSAN AGROMYZIDAE. 319 



latter situati'd on near to the eve iiiargin ; aiitemise iioruial iii size, tlie 

 upper surface of the basal joint at just about the middle of profile, 

 second joint with a short apical l)ristle on the dorsum, third joint slightly 

 elongate, apex rounded, pilosit,y 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 (Hfferentiated. !Mesonotum with 4 pairs 

 of dorso-centrals, the two anterior pairs distinctly reduced in size ; discal 

 setulse numerous, al)Out S rather iiregular rows between the anterior 

 dorso-centrals ; the })air 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, 

 venation as fig. 14. 



Length : 8*5 nun. 



Locality : Chip-Chip. One specimen, March. 



'.». Agromyza niveipennis n. sp. 



Male: Black, slightly shining. Frons opaque, brown- black, the orbits 

 subopaque ; face brownish ; palpi and proboscis black. Bquamse and the 

 fringes j^ellowish-white. Legs black, fore tibiae and the bases of all the tarsi 

 brownish yellow. Wings whitish, the veins vitreous, with the exception of 

 the costa, which is lirown. Halteres yellow, knob whitish. 



Head rather large, the frons slightly buccate, the face sUglith' retreat- 

 ing; width of frons one third that of head, orl)its 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; antennae 

 of good size, third joint slightly acute at the apex on the upper side, arista 

 about 21/2 times as long as the third joint of the antennse, 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 setulse numerous, and in the line of the dorso-centrals rather strong. 

 Abdomen broadly ovate; hypopygium very similar to that of jyarmcorms 

 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 21/2 times as long as the penultimate section, 



