12 Bulletin 332 



EXPLANATION OF FIGURES 



All figures are known to be typical of A. aveme and A. pomi (and 

 probably A. sorbi) unless otherwise designated. 



Fig. 1 — Dorsal view of a normal dormant egg. 



Fig. 2 & 3 — Dorsal views of eggs showing unusual types of splitting 



in the outer semi-transparent covering. 

 Pig 4 — Dorsal view of an egg showing an early stage in the usual type 



of splitting of the outer semi-transparent layer. 

 Fig. 5 — Dorsal view of an egg showing an advanced stage in the usual 



type of splitting of the outer semi-transparent layer. 

 Fig. 6 — Lateral view of egg seen in figure 5 showing the elevated inner 



pigmented layer, or chorion. 

 Fig. 7 — Dorsal view of an egg of A. avcncc showing an early stage in the 



emergence of the nymph. Note the egg burster on the head of 



the nymph along the meson and the cut pigmented layer. 

 Fig. 8 — Dorsal view of an empty egg shell showing usual method of 



splitting. 

 Fig. 9 — Dorsal view of an empty egg shell showing unusual method 



of splitting. 

 Fig. 10 — Dorsal view of a nymph of J. avctuc emerging from an egg; 



nymph about to free itself completely from the egg. 

 Fig. 11 — Dorsal view of an egg partly shriveled. 

 Fig. 12 — Dorsal view of an egg completely collapsed. 

 Fig. 13 — Dorsal view of an egg, similar to figure 5, which has been 



sprayed with a 2 per cent solution of crude carbolic acid. Observe 



the wrinkled outer semi-transparent layer. 



Fig. 14 — Dorsal view of an egg, similar to figure 5, showing early stage 

 in usual method of shrivel when egg has been treated with various 

 sprays, particularly crude carbolic acid and miscible oils. 



ABBREVIATIONS 



ant. Antenna 



b. Egg burster 



■ d. Depression 



e. Elevation 



n. Nymph 



p. Inner pigmented layer (chorion) 



s. Split or opening in empty hatched eggs 



t. Outer semi-transparent layer 



V. Exuvium (?) 



