238 



H. H. ROSS 



r-4 W rt 



. ^ f^ o 



Xi 0) OJ o 



O T3 XI J3 



9Swith 

 setal patch 



cleft — AT 

 shallow ]^clasper 

 cleft deep 



Fig. 5. Family tree and distribution of Anagapetus, an archaic genus 

 of small caddisflies restricted to western North America. (From Ross, 

 1956.) 



