Monograph of the Collembola and Thysanura

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Ray Society, 1873 - Collembola - 276 pages
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Page 109 - Then the female pretends to run away and the male " runs after her with a queer appearance of anger, gets " in front and stands facing her again ; then she turns " coyly round, but he, quicker and more active, scuttles " round too, and seems to whip her with his antennae ; " then for a bit they stand face to face, play with their " antennse, and seem to be all in all to one another.
Page 54 - This, however, is a rare case ; and it is possible that the principal use of the wings was, primordially, to enable the mature forms to pass from pond to pond, thus securing fresh habitats and perhaps avoiding in-and-in breeding. If so, the development of wings would tend to be relegated to a late period of life ; and by the tendency to the inheritance of characters at corresponding ages, to which Mr.
Page 42 - Arthropoda (Crustacea, Insecta, Myriopoda, and Arachnida) are indeed all branches of a common stem (and of this there can scarcely be a doubt), it is evident that the water-inhabiting and water-breathing Crustacea must be regarded as the original stem from which the other (terrestrial) classes, with their tracheal respiration, have branched off.
Page 54 - If these views are correct, the genus Campodea must be regarded as a form of remarkable interest, since it is the living representative of a primaeval type from which not only the Collembola and Thysanura, but the other great orders of insects have all derived their origin.
Page 50 - Collembola generally, in which the mandibles and maxillae are retracted, but, though far from strong, have some freedom of motion, and can be used for biting and chewing soft substances. This type is intermediate between the other two. Assuming that certain representatives of such a type...
Page 51 - ... the silkworm. When, however, any considerable change was involved, this period of fasting would be prolonged, and would lead to the existence of a third condition, that of the pupa, intermediate between the other two. Since other changes are more conspicuous than those relating to the mouth, we are apt to associate the...
Page 88 - ... to be indicated by a slight indentation. The labrum is distinctly defined by a well marked suture, and forms a squarish knoblike protuberance, and in size is quite large compared to the clypeus. From this time begins the process of degradation, when the insect assumes its Thysanurous characters, which consist in an approach to the form of the Myriapodous head, the front, or clypeal region being reduced to a minimum, and the antennœ and eyes brought in closer proximity to the mouth than in any...
Page 106 - Buskii differ in several points, but the examination of a large number of specimens has convinced me that our English species, in some cases, corresponds pretty well with the short descriptions of Linneus, Geoffroy, and other early authors. Our brown Smynthuri appear to form one species only. At first I was disposed to think that Geoffroy's P. fusca was only a variety of his P.fusco nigra. Some specimens of Papirius fuscus, however, agree in colour pretty well with his description, and he may, perhaps,...
Page 44 - The larvae of insects are by no means mere stages in the" development of the perfect animal. On the contrary, they are subject to the influence of Natural Selection, and undergo changes which have reference entirely to their own requirements and condition. It is evident then that, while the embryonic development of an animal in the egg gives...
Page 92 - ... must come into play. But these, by the same action, tend to bend the body forward on the legs, and if the body is to be kept straight, they must be neutralized by the action of the muscles of the buttocks and of the back.

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