1967] 
Roth — Rotation of the Ootheca 
93 
Figures 17-24. Oothecae of Polyphagidae. Fig. 17. Arenivaga (Psammo- 
blatta) cerverae, (X 2.0). Fig. 18. Polyphaga aegyptiaca, (X 3.6). Fig. 
19. Flange of A. (P.) cerverae, (X 17.6). Fig. 20. Euthyrrhapha pacifica , 
(X 11.0) (Arrow points to flange which is twisted laterally). Fig. 21. 
Arenivaga (Arenivaga) sp. A. (X 6.8). Fig. 22. Arenivaga (Arenivaga) 
bolliana. (X 4.2). Fig. 23. Arenivaga (Arenivaga) sp. B. (X 4.7). Fig. 
24. Therea petiveriana, (X 3.4). 
(In figures 21-23 the flattened flange is on the right side and in figure 24 
it is on the left.) 
( A .) apacha, but are quite different in several particulars. . . . The 
proventriculus is more like that of Polyphaga aegyptiaca than that 
of Arenivaga apacha.” The fact that A. (Psammohlatta) cerverae 
does not rotate its ootheca whereas species of the subgenus Arenivaga 
do, lends support to McKittrick’s view that these should be in dif- 
ferent subfamilies and probably should be different genera. A detailed 
study of the oviposition behavior and structure of the oothecae of 
