[1 1 F. B. SUMNER, M. E. MCDANIEL AND R. R. HUESTIS. 



Our material was likewise subdivided according to the size of 

 the brood, the seasonal cycles for broods of one to six individuals 



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FIG. 4. Seasonal variations in the sex ratio for pure and hybrid stock, 

 treated separately. Continuous line = pure. Broken line = hybrids. 



