FOHMOSAN AGIiOMYZIDAK. 323 



<as long as tlie penultimate section; and the last section of the fifth is ahout 

 three fifths as long as the penultimate section. 



Length: 3 mm. 



Locality: Sokotsu, May, 1912. One specimen. 



1'). Agromyza obtusa n. sp. 



Male: (ilossy l)lack. Frons opa(iue hlack. orliits and fiontal triangle 

 glossy black, with a slight g)'eenisli tinge; frontal lunule white pollinose; 

 antennae, arista, and palpi, black, proboscis brown at apex. Mesonotum and 

 pleurae with a blue-green tinge, which at some angles presents a violaceous 

 shade. Abdomen glossy black, the surface metallic, in some lights bronzy, 

 in others with a violaceous tinge on a greenish- blue ground. Legs shining 

 black. Wings clear, veins brown, yellowish at their bases. Squamae white, 

 fringe concolorous. Halteres black. 



Frons very slightly over one third the width of head; frontal triangle 

 broad and well defined, its sides gradually converging anteriorly, and 

 slightly convex; orbits distinct, with slight swellings at the bases of the 

 bristles ; 4 pairs of orbitals present, which are very stout and decrease but 

 little in strength anteriorly, the anterior 2 pairs directed inwards, the 2 

 posterior pairs directed backwards ; antennae of moderate size, second joint 

 with the dorsal bristle distinct, third joint rounded ; arista slightly tapering 

 at base of last section, the pubescence distinct, very fine, and not closely 

 placed; eyes pubescent, a small area on the upper surface very distinctly 

 haired ; cheek almost linear, slightly higher on the posterior half, marginal 

 hairs very numerous, but not strong, the vibrissa not differentiated. Meso- 

 notum with 2 pairs of strong dorso- centrals, and sometimes a weak pair 

 of setulae in front of the anterior pair; discal hairs short and closely placed, 

 8—10 rather irregular rows between the anterior dorso-centrals ; no distinct 

 bristles between the posterior dorso-centrals. Abdomen l)r()a(lly ovate; 

 discal hairs strong and numerous, but not long; hypopygium normal. 

 Legs strong, femora slightly thickened ; fore tibia with a short setula on 

 the posterior surface at about the middle; raid tibia with the two posterior 

 setulae present, but not very strong. Wings of normal breadth ; inner cross 

 vein at, or very slightly on either side of, the middle of the discal cell; last 

 section of fourth vein about 3 times as long as the penultimate section; 

 last sections of veins 3 and 4 slightly divergent: last section of fifth vein 

 about three fifths as long as penultimate section. 



Length: 2*75— 3 mm. 



Female: Similar in coloration to the male. Differing as 'follows : The 

 eyes are very indistinctly i)ul)escent : the oi-bits have more distinct short 



•21* 



