224 NATURAL HISTORY OF AQUATIC INSECTS CH. 



-s 



FIG. 79. Agriotypus armntus. A, imago ; B, pupa ; D, larva ; E, Agriotypised case 

 fjf Silo ; G, section of ditto, showing r/ 1 , fore operculum ; w l , hind ditto of case ; 

 5, remains of Silo larva ; fig, pupa of Agriotypus ; e, remains of cast larval skin 

 of ditto. From Klapalek'. 



