76 



1 . Observe the hanging attitude of the larva. 

 Note the angle it makes with the surface of the 

 water, and how this varies in different species. 

 Note, if the larva of C. concolor is being examined, 

 that the position is nearly horizontal. 



2. Observe the large head, the prominent 

 eyes and projecting antennae. 



^ 



Fig. 22. Respiratory Syphons of Larvae. 



(i) Stegomyia ; (2) Culex ; (3) Cu/ex with Large Syphon Tube ; 



(4) Taeniorhynchus ; (5) Cannibal Larva {? C. conco/or) ; 



(6) Enormous Syphon Tube {one-quarter scale of others, 



genus undetermined) ; (7) Spine on Tube seen on 



the flat ; (8) Spine seen sideways 



3. Note the long respiratory syphon arising 

 from the eighth abdominal segment. 



Place a half- grown larva under a cover glass 

 and examine under one-third inch objective. 



I. Make an accurate drawing of the 

 antennae. 



