. The Canadian field-naturalist. The number of caudal scales in the Ottawa litter varies from 58 to 71 for females and from 71 to 85 for males (Figure 3,A). Only one male and female have 71 caudals. The range for the 42 adult specimens is not as great and there is no overlap (Figure 3,C). The range for the 30 young Portland is narrow and the sexual dimorphism of the caudal scale count is even more marked (Figure 3,B). n. FUl I â â. Figure 3. Caudal scale counts for male (black squares) and female (open squares) Natrix s. sipedon from the Ottawa litter. Note the sexual dimorphism with an overla

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. The Canadian field-naturalist. The number of caudal scales in the Ottawa litter varies from 58 to 71 for females and from 71 to 85 for males (Figure 3,A). Only one male and female have 71 caudals. The range for the 42 adult specimens is not as great and there is no overlap (Figure 3,C). The range for the 30 young Portland is narrow and the sexual dimorphism of the caudal scale count is even more marked (Figure 3,B). n. FUl I â â. Figure 3. Caudal scale counts for male (black squares) and female (open squares) Natrix s. sipedon from the Ottawa litter. Note the sexual dimorphism with an overlap (at 71) of only one scale. Samples A, B, and C as in Figure Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club

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