. Entomology : with special reference to its biological and economic aspects. Callosamia promethea; A, male, clinging to cocoon; B, female. Reduced, comparatively rare among beetles. Of Hymenoptera, someof the Tenthredinidae exhibit colorational antigeny. Among tropical butterflies there are not a few instances inwhich the special coloration of the female is adaptive—har-monizing with the surroundings or else imitating with remark-able precision the coloration of another species which is known 208 ENTOMOLOGY to be immune from the attacks of birds—as described this way. as \\allace su
. Entomology : with special reference to its biological and economic aspects. Callosamia promethea; A, male, clinging to cocoon; B, female. Reduced, comparatively rare among beetles. Of Hymenoptera, someof the Tenthredinidae exhibit colorational antigeny. Among tropical butterflies there are not a few instances inwhich the special coloration of the female is adaptive—har-monizing with the surroundings or else imitating with remark-able precision the coloration of another species which is known 208 ENTOMOLOGY to be immune from the attacks of birds—as described this way. as \\allace suggests, the egg-laden females mayescape destruction, as they sluggishly seek the proper plantsupon which to lay their eggs. Here would be a fair field forthe operation of natural selection. In most insects, however, sexual differences in colorationare apparently of no protective value and are usually so trivialand variable to be of no use for recognition pur-poses. The usual statement that these differences facilitatesexual recognition is a pure assumption,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
