352 INEZ WHIFFLE WILDER AND ELIZABETH BARRETT PEABODY. 



viduals which had definitely passed beyond the indeterminate 

 sexual stage to a point where sex could be definitely diagnosed. 

 The following summary is, therefore, based upon the study of 

 gonads of animals of a length of 27 mm. and over, the arbitrary 

 minimum of 27 mm. being taken as approximately representing 

 the dividing line between those individuals in which the sex is 

 still, if not indifferent, at least frequently difficult to determine, 

 and those in which the sex is unquestionably established and 

 recognizable. 



SUMMARY OF PERCENTAGE OF OCCURRENCE. 



Typical larval individuals (of 27 mm. and over in length) 



Total number sexed . 178 



Number of males 86, or 48.3 % 



Number of females 89, or 50.0 % 



Number of hermaphrodites 3, or 1.68% 



Individuals in incipient phase of premetamorphosis 



Total number sexed . . . .' 333 



Number of males 177, or 53.2 % 



Number of females 152, or 45.7 % 



Number of hermaphrodites 4, or 1.2 % 



Premetamorphic individuals (beyond incipient phase) 



Total number sexed 256 



Number of males 119, or 46.5 % 



Number of females 134, or 52.3 % 



Number of hermaphrodites 3, or 1.2 % 



Metamorphic individuals 



Total number sexed 226 



Number of males 115, or 50.8 % 



Number of females 107, or 47.4 % 



Number of hermaphrodites 4, or 1.8 % 



Adult individuals 



Total number sexed 120 



Number of males 77, or 64.0 % 



Number of females 42, or 35.0 % 



Number of hermaphrodites i, or 0.83% 



All individuals exclusive of adults 



Total number sexed 993 



Number of males 497, or 50.05% 



Number of females 482, or 48.53% 



Number of hermaphrodites 14, or 1.41% 



