1983] 
Root & Messina — Exenia canadensis 
69 
Figs. 14: Cases of E. canadensis. F Egg case with egg stalk attached to stem. 2, 
View from top of case before cap has been added (egg was removed). 3, Close-up of 
egg stalk and base. 4, Case of 1st instar larva. Arrow indicates juncture between 
original egg case and larval additions. Scale bars = 500 (Fig. 4), 200 (Figs. 1-2), or 
100 (Fig. 3) /um. 
