ON THE LIFE HISTORY OF UGIMYA. 81 



proper relative sizes. The two large lateral lobes of the head {PL VI, 

 fig. 3 a), receiving a light copper red pigment, become the compound 

 eyes. On the anterior edge of the head, a pair of antennœ (PL VI, 

 fig. 4 a) appears, which are laid flat on the under side of the head, 

 and lie in a depression excavated just above the insertion of the 

 mouth-parts. The tiny processes (PL VI, fig. 4 h) on either side of 

 the insertion of the mouth-parts grow larger ; and the top-shaped 

 bodies (P/. VI, fig. 3 h) at the junction of the head and thorax recede 

 backwards in proportion as the head grows in size, and thus become 

 attached to the anterior corners of the thorax. The summit of each 

 top-shaped body (PL VI, fig. 3 h) is covered with a round chitinous 

 disc (PL VI, fig. 3 e), in the centre of which stands a long pointed 

 chitinous tube (PL VI, fig. 3f). The pointed end of the tube projects 

 through a perforation (PL V, fig. 7 a ; PL VI, fig. 3 d) at the side of 

 the fifth segment of the puparium, and formed no doubt on the mem- 

 branous disc on the top of the fleshy protuberance (PL VI, fig. 8 a) 

 which w^e found on each side of the fifth segment of the maggot. 

 Fi'om this circumstance, it will be seen that the head of the pupa is 

 formed out of the anterior four segments of the maggot. Dorsally 

 the space (PL VI, fig.3g) between the compound eyes is covered 

 with long hairs which are arranged on each side in a single row 

 along the inner side of the compound eye. The thorax (PL VI, fig. 

 3 ]t) h now separated into three segments by the presence of two 

 slight transverse lines. The anterior two segments are covered with 

 six longitudinal rows of long hairs ; but the last has hairs only on 

 its posterior rounded edge. The wings (PL VI, fig. 4 c) grow larger 

 in size, and have each a fold on the outer edge. The abdomen (/-'/. 

 VI, fig. 3 i) is also separated into four segments by three transverse 

 lines, but no hairs can as yet be seen on its surflice. 



On the 28th day (4 weeks), the pupa (7^/. VI, figs. 5 and 6) has 



