Previous Step (19b)
21a Length of subgenital plate of male equal or greater than length of preceding sternite. Base of antennae depressed and broadened. Internal spurs of caudal tibia moderately unequal. go to 22
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21b Length of subgenital plate of male distinctly less than length of preceding sternite (measurements taken on mid-ventral line). Base of antennae weakly depressed and scarcely broadened. Internal spurs of caudal tibia equal. go to 23
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