. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . seous to birds, and thecolor pattern of that species is mimicked by other species ofbutterfly belonging to another genus. Then, there is the robberfly (described further on), which masquerades as a bumblebee,and in this mimicry is not only presumed to be protected,but is able to steal upon its prey unsuspected. In this meansof protection natural selection is supposed to have been afactor in preserving modificat
. Nature sketches in temperate America, a series of sketches and a popular account of insects, birds, and plants, treated from some aspects of their evolution and ecological relations . seous to birds, and thecolor pattern of that species is mimicked by other species ofbutterfly belonging to another genus. Then, there is the robberfly (described further on), which masquerades as a bumblebee,and in this mimicry is not only presumed to be protected,but is able to steal upon its prey unsuspected. In this meansof protection natural selection is supposed to have been afactor in preserving modifications of structure. It is throughslight differentiations and modifications; of structure withtransmission by inheritance that these extreme specializationsof form appear to have been brought about. Coexistent with these changes in animal life are modificationsin the structure of plant life. For example, in some of thehigher plants we find a great variety of the blossoms so modifiedand dependent upon the insect life that it is supposed thatthey would become exterminated were the insects that effectpollination to die out. The period in which plants blossom is presumed to be brought. The Female Arboreal Katydid( Cyrtophyllus perspicillatux) The green arboreal katydid is perfectly concealed xchite living among the foliage of treex. The male gives forth the familiar notes katy-did. Fr07n a photograph. EVOLUTION AND NATURAL SELECTION 21 about primarily by climatic conditions, but secondarily bynatural selection. These adaptations have been affected byreason of the interrelation of insects and humming-birds toflowers, and also their adjustment to change of climate. Thecolumbine blossoms in May at a time when the humming-bird and hawk-moth, which participate in its polhnation, maketheir appearance. One of the most beautiful examples ofadaptation found in our temperate chmate is the Uttle orange-tip butterfly with its associated white-flowered Arabis. Thebutterfly pollinates this flower
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjectins
