and Life History of Psychoda sexpundata. 303 



Tracheal System of the Pupa (Fig. 8). 



The tracheal system of the pupa is closed, the contained 

 air being renewed by means of the 

 prothoracic respiratory appendages, 

 a pair of hollow finger-shaped 

 processes, which project forward 

 from the prothorax. A tracheal 

 extention (Fig. 9) — Hornfilzkammer 

 of De Meijere — lies within the 

 respiratory appendage. The structure 

 of the wall of the pupal respiratory 

 appendage is not unlike that of 

 Ptychoptcra. In places the tracheal 

 extension bulges through the wall 

 of the respiratory appendage, giving 



Fig. 9 ( x 40). 

 Tracheal extension of pupa. 



Fig. 8 ( x 20). 

 Tracheal system of pupa. 



Fig. 10 ( x 100). 

 Transverse section of tracheal extension of pupa. 



