1953] 
Nutting — Reproduction in Blaberus 
13 
the period between oothecae may be measured in weeks 
rather than in days as in Periplaneta (Gould and Deay, 
1940). The brood sac is very large, and the development 
of the genital pouch approaches that of Diploptera. Lastly, 
the ootheca is soft, thin, and open, and is retained in the 
brood sac until hatching. In summary, the major modifi- 
cations toward viviparity in Blaberus have occurred in the 
mother and not in the embryo. 
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