478 THE AMERICAN NATURALIST. 
mm.in diameter. These facts would indicate that August was 
the breeding time of Fontaria virginiensis, some of the females 
having deposited their eggs, while others still retained theirs. 
Of the total number collected, 622, or 47.517145, are males, 
and 687, or 52.482875, are females. Over 100 each of the males 
and females were studied with the view of determining the 
occurrence of variations; first, in regard to the number of 
the segments of the body; second, in regard to the number 
and bilateral symmetry of the legs; third, in regard to the 
number of segments in the antenne. 
First, the number of segments was found to be twenty, 
with no variation whatever from this number; second, the 
pairs of legs were thirty in the male and thirty-one in the 
female, with no variations; as far as the number of legs was 
concerned there was perfect bilateral symmetry; third, the 
antenna contain seven segments, and no variation from this 
number was found. 
