potassium hydroxide hi/ Dicranura vinida. 291 



at the cocoon may also serve to eject successive quantities 

 of potassiuiQ hj'droxide. 





Fig. 1.— Ventral view of freshly emerged imago of I), iniiula, showing 

 pupal shield, s, pupal eyes, jj. e., and processes of labrum of imago, a a, 

 just visible below shield. 



Fig. 2. — Head of imago denuded of scales, showing, a a, the labral 

 processes ; b h, grooves terminating above in sockets for reception of /; h 

 in fig. 4 ; c c, basal joint of antennte ; d, median anterior region of head ; 

 e e, eyes. 



Fig. 3. — Outer surface of pupal shield, slightly flattened to show its 

 full extent: j). c, pupal eyes; s., points to same spot as in fig. 1. p. L, 

 pupal labrum. 



Fig. 4. — Inner surface of same, /t /;, hooks for attachment of shield 

 by locking with h h, tig. 2. Other letters as before. 



I may mention that the whole surface of the body of 

 a freshly emerged imago is damp with an alkaline fluid, 

 but this is probably due to the whole body having to 

 pass through the aperture in the cocoon which is moist 

 with the hydroxide. I am not able to speak with certainty 

 on the manner in which the imago gets rid of the 



