260 



D1XIDJE. 



and if detached forcibly and plunged into deeper water it swims 

 energetically, but in an erratic course, to regain as near as possible 

 its original position. Its food is microscopic. 



Fig. 38. Early stages of Visa : a, lateral view of larva; b, anterior 

 segments of larva, dorsal view ; c, terminal segments of 

 larva, dorsal view ; d, lateral view of pupa; c, anterior half 

 of pupa, ventral view (after Miall). 



The pupa of Dixa is black and inconspicuous, apparently without 

 power of voluntary motion, lying resting in a vertical position at 

 the surface of still water, or surrounded by decaying vegetation 

 near the shore. It has a large elongate respiratory organ on each 

 side of the head ; the body is long and larva-like, terminated by 

 two moderately long pointed processes. 



Table of Species. 



1, Wing with more markings than a 



narrow transverse streak across the 



middle 2. 



Wing with only a narrow transverse 

 streak across the middle. Thoracic 

 stripes dark brown ; abdomen blackish . 4. 



2. Wing-tip distinctly infuscated for a 



little distance. Thoracic stripes 

 brownish yellow ; abdomen brownish 

 yellow ochrilineata, Brun., p. 261. 



