H. ^r. Morris KIo 



segineuts bear two transvei'se rows of setae, with a nuinber of smafi 

 groups of setae. The first three segments are without the two transverse 

 rows, but bear instead a pair of groups of setae. These, especially on 

 the second and third segments, are rather horse-shoe shaped, with the 

 opening anteriorly. 



The eleventh segment bears, on its ventral surface, a transverse row 

 of setae, near its posterior margin. Placed in front of these setae is a 

 second but incomplete transverse row. 



The twelfth segment is ])rovided ventrally with a number of large 

 setae surrounding the anus, with a smaller row on each side. 



Between all the segments, both dorsally and ventrally, are a number 

 of short spines. On the first three segments they are arranged in groups 

 of from three to five in a short row (Plate X, fig. 8), while on the 

 remaining segments they are separate and not grouped together 

 (Plate X, fig. 7). 



On the first two segments the dorsal transverse row of setae is 

 composed, on all the larvae I have been able to examine, of short blunt 

 processes, which in size and colour resemble the basal part of the largest 

 and longest of the other setae. In some cases the tops of these processes 

 were flat, as if the upper part had been broken ofT, but some of them 

 were rather conical in shape. 



;}. THE PUPA. 



The pupa (Plate X, figs. 2 and 3) is formed within the larval skin, 

 which is persistent and remains entire except for a longitudinal slit 

 exposing the back of the thorax of the pupa. It foreshadows, therefore, 

 the puparium of the higher Diptera. 



The pupa does not completely fill the larval skin, an empty space 

 being left within the skin at both ends. The abdominal spiracles of the 

 pupa project through the larval skin laterally, and are closer together 

 than those of the larva. The thoracic spiracles are exposed by the 

 splitting of the anterior dorsal part of the larval skin. The larval skin 

 thus afiords some slight protection to the pupa; this protection must, 

 however, be very slight as the skin is easily torn. 



The pupa, when completely removed from the larval skin, is of a 

 uniform reddish-brown colour and is about 4 mm. long, 1-2 mm. broad 

 across the thorax and 1-3 mm. broad across the widest part of the 

 abdomen, which is slightly flattened. 



There are six pairs of abdominal spiracles. These project laterally 

 to the extent of about -11 mm. and are situated on the anterior pai't of 



