NOTIDOBIA CILIARIS 51 



and the surrounding substance seems to be 

 made of a fine sand glued into a fairly hard 

 plate (Fig. 22). 



FIG. 22. Pupal grating of Sericostoma personatum t 

 The Welshman's button. 



Family . . SERICOSTOMATID.E 

 Genus . . Notidobia 

 Species . . ciliaris 

 Spurs, 2.2.4. 



PLATE X 



Notidobia ciliaris is a black caddis-fly com- 

 mon on most rivers, and closely akin to Serico- Cllia " s 

 stoma personatum. This is evidenced both by 



