Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders (Classic Reprint) - Softcover

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Excerpt from Observations on Sexual Selection in Spiders of the Family Attidæ, And, Protective Resemblance in Spiders

Females. The most vigorous and energetic usually being able to rear most offspring, intensity of color, if dependent on or cor related with vigor, would tend to increase. But as differences of Color depend upon minute chemical or structural differences in the organism, increasing vigor acting unequally on different portions of the integument, and often producing at the same time abnormal developments of hair, horns, scales, feathers, etc., would almost necessarily lead also to variable distribution of color and thus to the production of new tints and markings. These acquired colors would be transmitted to both sexes, or to one only, according as they first appeared at an early age, or in adults of one sex; but in all cases where an increasing development of color became disadvantageous to the female, it would be checked by natural selection; and thus produce the numerous instances of protective coloring in the female only, 'which occur in these two groups, birds and butter flies.1.

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