-11- 



Hydroptila Dalman 1819 



1. Seventh sternite with a 



long median process. fig* 32 



Seventh sternite with a 



short median process. fig* 33 



2. 10th tergite with apex 

 divided into a pair of 

 stout heavily sclerotized 

 arms that are curved 

 sharply mesad at their 



apex. fig. 34 



10th tergite not divided 

 as above 



3. 8th sternite with an apico- 

 mesal sclerotized projec- 

 tion; median process of 7th 

 sternite usually narrowed 



at apex. fig* 35 



8th sternite without apico- 

 mesal process; 7th sternite 

 process not narrowed. 



4. Claspers short and beak 

 like; 10th tergite longer 

 than claspers. 



- Claspers slender, long; 

 10th tergite shorter than 

 claspers. 



5. Apical part of aedeagus 

 divided into three (3) 

 processes. 



- Apical part of aedeagus 

 divided into two (2) 

 processes. 



6. Apex of aedeagus with three 

 long filamentous processes. 

 Claspers long, slender 

 closely appressed on meson; 

 10th tergite deeply cleft 



on meson. fig« 36 



- Apex of aedeagus with two 

 long and one short fila- 

 ments. 



-2 



-17 



xella Ross 1941 



-3 



virgata Ross 1938 



-4 



-5 



-15 



-6 



callia Denning 1947 



-7 



