32 0. SASAKI. 



deepened much in color until it is now dark brown The top-shaped 

 bodies (PL VI, fig. 5 a, fig. 7) are well developed; and on their summit 

 rests a chitinous disc (P/. TT, fig. 7 a). The smaller or proximal end 

 of these bodies opens into a spiracle situated on the sides of the pro- 

 thorax of the pupa. On the outside and very close to this small 

 end lies a bright reddish yellow disc of an oval_shape (P/. TV, fig. 7 />), 

 the surface of which is marked with reticulated ridges. The function 

 of this oval disc seems to be to prevent the smaller end of the mem- 

 branous tube from closing up and interrupting the passage for the 

 entrance of the external air. The mouth-parts are developed further 

 than on the last stage, and form a rudimentary proboscis which is now 

 separable into basi-proboscis (P/. TT, fig. 6 /;p) and proboscis proper, 

 {PI. VI, 6 pp). The labrum which has a wedge-shape (PL VI, fig. 

 6 h) lies on the proboscis proper with its pointed end toward the 

 labellœ (PI VI, fig. 6 d). The maxillary palpi (PL VI, fig. 6 a) which 

 arise on each side of the distal portion of the basi-proboscis are de- 

 veloped into short thread-like processes. The labium (PL VI, fig. 6c) 

 which forms a greater portion of the proboscis proper has its floor 

 protected by a chitinous shield, and its free end divided into two ex- 

 panded lobes (PL VI, fig. 6 d) by a slight constriction. The margin 

 of these lobes is covered with a few bristles, and their inner surfoce 

 is closely beset with many transverse ridges (pseudotrachea?). The 

 segments of the abdomen become more distinct, and are covered with 

 a few transverse rows of conspicuous hairs. 



On the 35th day, the body of the pupa has become uniformly 

 darker in c<jlor (PL VI, fig. 8 and 9). The simple eyes (fig. 8 a) be- 

 come more distinct, and the insertion of the maxillary palpi (fig. 9 a) 

 ascends a little above their previous position. In this state the pupa 

 remains through the winter months to the following spring, generally 

 to April. The only external changes which I have observed in the 



