Plate XX. 



Life hisiory iif I'heosia dimidiaia. 



Fig. 1. Pheog'ui dimUHalu, Stage I; la, side view. 



Fig. 2. I'heosia diinidiatii, Stage II; 2a, side view. 



Fi(i. 3. I'heosia dimidiaia, Stage III; So, side view. 



Fid. 4. Vheoaia dimidiaia, Stage IV; 4o, side view. 



Fig. 5. Pheosia dimidiaia, Stage V; iia, side view. 



Fig. 6. Pheosia dimidiaia. Stage V; 6a, side view. 



Fig. 7. Pheosia dimidiaia, Stage Y; about to pujjate. Bridgham del. 



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