92 



3- In Stegomyia the syphons are broadly tri- 

 angular, and are characteristic. Note the marked 

 contrast in appearance to those of Culex (Fig. 25A). 



Fig. 25A. Nymphal Syphon Tube of Stegomyia 



Examine the nymphs of Corethra and Moch- 

 lonyx when they are, encountered. 



(a) Note in Corethra the pointed syphons and 

 the straight tail (Figs. 25 and 26). 



(6) Note in Mochlonyx the Ciilex-like nymph 

 and the thin rounded and pointed syphons (Fig. 25). 



Fig. 26. Nymphs of Chironomus and Corethra 



