THE PHORIDAE OF FORMOSA. 
551 
Described from a single female from Polisha, December, 1908. 
This species may be readily known by the characters given in the 
key to species. 
Aphiochæta nana n. sp. 
Female. Length D3 mm. Piceous black, the four anterior legs 
yellowish and the wings hyaline with all the veins weakly colored. Head 
stout and quite evenly sloped off above on the front so that it is wedge- 
shaped above when seen in profile. Front about as wide as high, its 
surface dull and more densely hairy than usual. Four proclinate setæ 
in two pairs at the center of the anterior margin of the front, the 
lower pair much smaller than the upper and placed almost beneath 
them. Next row above of four, reclinate, forming a pair at each lateral 
angle of the front, but the lower bristle is far removed from the eye, 
being placed midway between the upper proclinate bristle and the lateral 
reclinate one which is almost contiguous with the eye margin ; middle 
frontal row of four equidistant bristles forming a nearly straight line, 
with the lateral bristle inserted just next to the eye margin ; ocellar 
row as usual; all the frontal bristles short and weak. Antennæ small, 
rounded, deeply set in the facial cavity; arista thickly pubescent, 
somewhat longer than the head height. Palpi with rather fine short 
bristles below and at tip, yellow ; proboscis short, but apparently heavily 
chitinized, fuscous. Mesonotum thinly pubescent, rather shining; bristly 
along the sides and with one pair of slender dorsocentral macrochætæ. 
Scutellum rather long, with two marginal bristles. Pleuræ entirely bare, 
the mesopleuræ not bristly above. Abdomen entirely dull black, the 
genitalia yellowish, its surface entirely bare except for scattered black 
hairs near the tip ; second segment somewhat elongated, but without 
bristles laterally. Legs long and slender, the femora not stout ; the 
antermr tarsi slightly thickened. Middle and posterior tibiæ weakly 
setulose along the inner side of the posterior edge. Middle and posterior 
legs piceous brown, the anterior ones lighter, brownish yellow. Wings 
clear hyaline, the venation pale except the costal vein. Wings broader 
in shape than usual, the outline regularly oblong-oval. Costal vein barely 
attaining the middle of the wing, beset with moderately short, delicate 
and not veiy densely placed bristles. First vein ending midway between 
the humeral cross-vein and the tip of the third vein ; second vein short, 
but running steeply to the costa, so that a rather large cell is formed 
at the furcation; fourth vein weakly and evenly curved; fifth, sixth, 
and sewenth each faintly sinuate, the fourth and fifth equidistant from 
the wing tip. Halteres yellowish white. 
