HOW TO KNOW THE IMMATURE INSECTS 



3b. Anal legs appearing as lateral sclerites oi 10th 

 abdominal segment. Fig. 403 5 



MiAi^ le^ 



Fig. 403. Apex of 

 obdomen. 



4a. Dorsum of 9th obdomincd segment with a sclerotized shield. 



Fig. 404 Family RHYACOPHIUDAE 



The larvae of the subfamily Rhyacophilinae ore 

 predacious and free-living while the larvae of the 

 subfamily Glossosomatinae are the saddle-case 

 makers. 



These are the most primitive of present-day cad- 

 disflies. The larvae are campodeiform and possess 

 tracheal gills. 



Fig. 404. Rhyoco- 

 phila fenestro 



Ross. ( Redrawn 

 from Ross) 



4b. Dorsum of 9th abdominal segment without a sclerotized shield. 

 Fig. 405 Family PHILOPOTAMIDAE 



The larvae are campodeiform and Hve gregarious- 

 ly in swift moimtain streams where they construct 

 net-like cases in the form of either cyUndrical tubes 

 or broad sacks. Prior to pupating, the larva builds a 

 rough shelter of stone and encloses itself in a cocoon. 



Fig. 405. Philo- 

 potamus sp. 

 ( Redrawn from 

 Ross) 



147 



