b C. SASAKI. 



may be folded on each other with their inner sur£ices in contact. 



The wings (27. I, fig. 3) are long and narrow becoming broader 

 towards the base. They are transparent and greyish in color; the 

 proximal portion is shaded dull brown. The entire surflice is thickly 

 covered with fine short hairs. The costal vein (a«) which runs along 

 the costa of the wing and ends at the apex (q) is strong and rigid, and 

 its portion near the base of the wing is thickened and covered with 

 long bristles, while the rest is provided with a single series of short 

 strong bristles. The fourth longitudinal vein (g) after reaching near 

 the outer oblique edge (/•) suddenly turns up and ends at a portion 

 a little above the apex (q). The fifth vein (//.) reaches the oblique 

 outer edge ; but the sixth ( i ) does not. The hinder margin of a 

 wing near its base is incised into three alar appendages (allidœ); two 

 (n, o) of them are supported each with a chitinous rod ( s and t ) 

 and the third alula (p and PL I, fig- 1 al) which is somewhat tri- 

 angular in form covers the upper corner of the abdomen, and conceals 

 the balancers from sight. The two allulœ ( o and p ) are colored 

 greyish yellow, and covered with a few fine hairs at their free margin. 



The legs are of a moderate size, black in color, and covered with 

 black hairs. There are eight pairs of spiracles on the body of the fly, 

 two of which open on the side of the thorax and the rest ( VI. I, 

 fig. 10 a)on the under surface of the abdomen. Of the two pairs of the 

 spiracles on the thorax, one ( P/. I, fig. 2a) opens on the" pro- and the 

 other on the meta-thorax. They are nearly spindle-like in form, Avith 

 their margin hardened by the deposition of a chitinous matter, and 

 their entrance protected by a series of finely branched hairs which 

 grow along the margin ( Pi J, fig. 8). On the abdomen, there are six 

 pairs of spiracles ( PL I, fig. 10), one in each segment placed near the 

 median ventral line. The abdominal spiracles ( PL I, fig. 9 ) differ in 

 shape from those on the thorax, each being a hollow chitinous cup. 



