FORMOSAN AGROMYZIDAE. 
315 
in size anteriorly; antennæ rather small, third joint rounded; arista slightly 
thickened, bare, and as long as length of frons ; head in profile as fig. 6 ; 
Mesonotum with 2 pairs of strong and 2 pairs of much weaker dorso-cen- 
trals, the third and anterior pairs the weakest, the former being close to 
the suture ; very few hairs on disc, no bristles discernable between the 
posterior pair of dorso- centrals ; scut ellum with four sub equal bristles. Legs 
normal ; no distinguishable bristles on mid tibia. Wing venation as fig. 5. 
Length: L25 mm. 
Locality: Tainan. One specimen. 
3, Agromyza flavofemorata n. sp. 
Male: Black. Head yellow, vertex, ocellar region and back of head 
black, orbits darkened posteriorly, becoming yellow anteriorly ; third 
antennal joint reddish, the basal joints clear yellow; arista black-brown; 
palpi and proboscis yellow. Mesonotum and scutellum glossy black; pleuræ- 
brown-black, opaque ; postnotum black, becoming yellow just below the- 
scutellum. Abdomen glossy black on dorsum, yellowish on venter; hypo- 
pygium black. Legs yellow, apices of tibiæ slightly, and the tarsi more 
distinctly browned. Wings clear, veins black, the base of wings yellowish. 
Squamæ yellow. Halteres yellow. 
Orbits with four pairs of bristles, which decrease slightly in strength 
anteriorly, orbits wide, each about equal to half the width of the central 
stripe, very few weak hairs on the orbits in addition to the bristles ; head 
in profile as fig. 7 ; arista with close and short pubescence ; vibrissa slightly 
differentiated. Mesonotum with very slight grayish pollinosity on sur¬ 
face; 4 pairs of dorso-centrals present, the 2 anterior pairs weak; about 
three rows of weak hairs between the dorso-centrals anteriorly, and no 
bristles between the posterior pair of dorso-centrals ; scutellum with 4 
subequal bristles. Abdomen elongate, cylindrical; hypopygium slightly 
over the normal size; all abdominal segments covered with short hairs. 
Legs rather slender; mid tibia without distinct bristles on the posterior 
surface. Wing as fig. 15. 
Length: L75. 
Locality : Polisha. One specimen. 
4. Agromyza formosensis n. sp. 
Male: Yellow, subopaque. Head pale yellow, back of head, vertex,, 
and ocellar region grayish, central stripe reddish yellow; third antennal 
joint with a large reddish-brown mark at the insertion of the arista, re- 
