Half hours with insects . thefemale, the winged active male, and what a striking diflTercnce !and yet both were exactly alike in the larval state. What arethe causes which have produced such a remarkable divergencebetween the two sexes ? They are for the most part mysteri-ous and beyond our comprehension, and yet by compaiingthe scale insects with other members of the family to which 40 HALF HOUES WITH IXSECTS. [Packard. they belong, such as the mealy bug of our hot-houses orCochineal insect of tropical countries and the Aleurodes, inwhich the sexual differences are less marked, and then c
Half hours with insects . thefemale, the winged active male, and what a striking diflTercnce !and yet both were exactly alike in the larval state. What arethe causes which have produced such a remarkable divergencebetween the two sexes ? They are for the most part mysteri-ous and beyond our comprehension, and yet by compaiingthe scale insects with other members of the family to which 40 HALF HOUES WITH IXSECTS. [Packard. they belong, such as the mealy bug of our hot-houses orCochineal insect of tropical countries and the Aleurodes, inwhich the sexual differences are less marked, and then com-. paring them with the aphides on the one hand, and on the otherthe Ps3lla, a member of anotherfamily closely allied, we are en-abled to see that the changes>:^ ,»c<^^p^j^^^^^^-^^^^, inform have been undoubtedly induced by differences in habits,the kind of surface to which thescales are attached, the species -, i_(^ of tree to which they belong, as well as to the different degreeof mobility of the female ; for themore she is fixed and immov-able, the more active and livelyis the male, just as in St3dopsFemaiestyiops ^^ bec-parasite, the female (Fig. 30) is remarkably different from the agile, volant male (Fig. 31). We may see in the aphis, where the two sexes are alike, that in their ^^^ 3^^ couitships the male finds its active partner in the ordinary move- \1^&^ me
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1881
