1967] 
Roth — Rotation of the Ootheca 
Figures 5-10. Arenivaga (Psammohlatta) cerverae carrying a completely 
formed ootheca. Fig. 5. Dorsal view, (X 2.1). Fig. 6. Ventral view, 
(X 2.1). Fig. 7. Dorsal view of a female in sand; the ootheca is twisted 
so that the keel faces to the left, (X 2.2). Fig. 8. Dorsal view; light coming 
from below showing the eggs visible inside the ootheca. Note that the 
anterior eggs do not lie in the vestibulum, (X 1.9). Figs. 9-10. Enlarged 
views of the ootheca shown in figures 1 and 2; note the flange (arrows) 
held securely in a vertical position by the paraprocts. (X 5.3) 
blatta sp. nov. rotated their oothecae but these were instances in 
which the females apparently had difficulty in dropping the egg cases. 
I have observed many females of the desert polyphagid, Arenivaga 
(Psammohlatta) cerverae (Bolivar) oviposit. Sometimes the ootheca 
was oriented with the keel laterad (Figs. 7,8) but this was not be- 
cause they had been rotated. The ootheca of A. cerverae has a long 
flange (Figs. 17,19) or “handle” which is held vertically between 
