EP HYDRIDE. 



305 



somewhat the rat-tailed larvae of the Syrphidae. The 

 mouth, however, always has booklets, and the 'tail' is 



Fig. 120. Ephydridse. 18, Lt/toyaster, sp. (Illinois), wing; 14, Lytoyaster, 

 abdomen; 15, Lytogaster, head; 16, Oc/tthcra, sp. wing; 17, Ochthera, sp. front 

 leg; 18, Ochtheroidea a'tra, male, front leg; 19, Brachi/dentera aryentata, wing; 

 20, Rrachydeiitera argentata, head; 21, Discocerina, sp. head; 22, Discocerina, 

 sp. bristles of front; 23, Gastrops, sp. head; 24, Part/dra sp. wing; 25, Pelo~ 

 mj/ia occit/pntdlix, l>ristles of tlioracic dorsum; 26, 27, Liporfurta, head (Co- 

 (jiiillett). 



