Explanation of Plate I 
Plate I. Perillus bioculatus Fabricius, showing the five nymphal stages; also dorsal aspect of 
eggs, and one egg in lateral aspect greatly enlarged; photograph from colored chart. 
Two figures represent stage V, with yellow or red color form above and white form 
below. 
Explanation of Plate II 
Fig. 1. Three fifth stage nymphs feeding on a large grub of the potato beetle. 
Figs. 2-5. Showing the actions of two fifth stage nymphs as they strugsle for control of a 
potato beetle grub. In figure 5 one nymph has placed all its weight on the other bug. 
Figs. 6-7. A fifth stage nymph of the white color form is shown in feeding attitudes, sus- 
pended largely by the hind legs. 
Fig. 8. Three nymphs of the fifth instar attacking two large potato beetle crubs. 
Fig.9. Seven fourth and fifth stage nymphs attacking a large potato beetle grub. 
Fig. ro. Adult Perillus, of pedigree stock, feeding on a potato beetle from which the elytra 
have been removed. 
fig. 11. Second stage nymphs feeding on eggs of the potato beetle, enlarged (X3). 
Fig. 12. Nymphs of the second and third instars feeding on newly hatched grubs of the potato 
beetle. 
Explanation of Plate II] 
Fig. 1. Perillus bioculatus, white color form, enlarged (*4™%). 
Fig. 
ty 
Perillus bioculatus, showing four color forms, enlarged (2); a, female, white color 
form; b, female, red color form; c, female, \ellow color form; d, male, dark red 
color form. 
Fig. 3. A series of Perillus bioculatus illustrating the range of color pattern and size (slightly 
reduced). 
Fig. 4. Perillus bioculatus, red female, shown in characteristic feeding position with potato 
beetle grub suspended in mid-air. 
Figs. 5-6. Perillus bioculatus, male and female (X1%), shown for comparison with a pair of 
Perillus circumcinctus (Stal) in figure ro. 
Figs. 7-8. Perillus circumcinctus (Stal) attacking potato beetle grub; (fig. 7) the grub grasps 
the plant’ stem and succeeds in throwing Perillus off its feet; (fig. 8) Perillus is 
shown retaining its hold with rostrum after losing all foot-holds. 
Fig.9. Podisus maculiventris (Say) in characteristic feeding position, with rostrum inserted 
on the ventral side of a potato beetle grub. $ 
Fig. 10. Perillus circumcinctus, male and female (X14). 
Fig. 11. Perillus circumcinctus feeding on grub of potato beetle (natural size). 
