Text-book of comparative anatomy . FIG. 330. — Machilis maritima,representing the traclieal system ofthe right side (after Oudemans). 7r,Head ; /, II, III, thoracic segments;1-10, abdominal segments; s, stig-mata. FIG. 340.— Half-developed larva of anagamous unwinged female of Aphis Pelar-gonii. The tracheal system seen from above(after Witlaczil). 7;, Head ; a, antenna ; /, II,III, segments of the thorax ; 1V-XII, segmentsof the abdomen ; 6j, bo, b3, the 3 pairs of legs ;s, the stigmata of the tracheal system. in the form of strands (Fig. 343, vf) ; these play an important part in the sheddin
Text-book of comparative anatomy . FIG. 330. — Machilis maritima,representing the traclieal system ofthe right side (after Oudemans). 7r,Head ; /, II, III, thoracic segments;1-10, abdominal segments; s, stig-mata. FIG. 340.— Half-developed larva of anagamous unwinged female of Aphis Pelar-gonii. The tracheal system seen from above(after Witlaczil). 7;, Head ; a, antenna ; /, II,III, segments of the thorax ; 1V-XII, segmentsof the abdomen ; 6j, bo, b3, the 3 pairs of legs ;s, the stigmata of the tracheal system. in the form of strands (Fig. 343, vf) ; these play an important part in the sheddingof the larval tracheae, and then for a time open outwardly. When the last larvalstage passes into the imaginal stage these strands become hollow, and the tracliealsystem becomes holopneustic. All such larvse breathe by means of tracheal gills. 3. In the majority of the larvte of insects which undergo complete metamorphosis,the stigmata of those segments which in the imago carry wings (meso- and meta-thorax) are closed, but on
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
