1967] 
Roth — Rotation of the Ootheca 
91 
Figures 11-16. Primitive rotation of the ootheca in the Polyphagidae. 
Figs. 11-12. Arenivaga (Arenivaga) sp. A (Kelso Dunes, California). 
Fig. 11. Ootheca being formed and still in the vertical position. Fig. 12. 
Odtheca rotated with keel to right, (X 2.8). Fig. 13. Arenivaga (Areni- 
vaga) sp. B (Coachella Valley, California). Ootheca rotated with keel 
toward left. Note the flange by which the ootheca is held and that none 
of the eggs are hidden in the vestibulum, (X 2.0). Fig. 14. Arenivaga 
(Arenivaga) bolliana. Ootheca rotated toward left. (From McKittrick, 
1964; courtesy of Dr. F. A. McKittrick), ( ca . X 1-9). Figs. 15-16. Therea 
petiveriana (India). Ootheca rotated to left. 15. Dorsal view. 16. Ventral 
view, (X 1-6). 
(Arrows in Figs. 12 and 14 point to flange by which the ootheca is held 
between the paraprocts). 
