Alternating Generations; a Biological Study of Oak Galls And Gall Flies
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To quickly assess the difficulty of the text, read a short excerpt:
For instance, if a fly is reared from a leaf-gall, and is furnished with an ovipositor which is not adapted for piercing leaves, it may be inferred with certainty that another generation, capable of pro- ducing leaf-galls, belongs to this fly.
It will be found of interest, therefore, to review the various forms of ovipositor described.
I. Neuroterus-Spathegaster Group.
A glance at the illustrations ^ of the two ovipositors will enable us to appreciate their great difference. In Neuroterus laevi...usculus (Fig. 2) the ovipositor is very long and spirally coiled ; in Spathegaster albipes, on the contrary (Fig. 2'^), it is short and slightly curved.
The other species of Neuroterus show a somewhat shorter ovipositor, especially Neuroterus fumipennis (Fig. 3). Spathegaster ovipositors do not vary. The Neuroterus ovipositor has a hook-shaped point, and can therefore never penetrate perpendicularly into a bud. The Spathegaster ovipositor, being only slightly curved, can pierce vertically the surface of the leaf.
What to read after Alternating Generations; a Biological Study of Oak Galls And Gall Flies?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Adler to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
For instance, if a fly is reared from a leaf-gall, and is furnished with an ovipositor which is not adapted for piercing leaves, it may be inferred with certainty that another generation, capable of pro- ducing leaf-galls, belongs to this fly.
It will be found of interest, therefore, to review the various forms of ovipositor described.
I. Neuroterus-Spathegaster Group.
A glance at the illustrations ^ of the two ovipositors will enable us to appreciate their great difference. In Neuroterus laevi...usculus (Fig. 2) the ovipositor is very long and spirally coiled ; in Spathegaster albipes, on the contrary (Fig. 2'^), it is short and slightly curved.
The other species of Neuroterus show a somewhat shorter ovipositor, especially Neuroterus fumipennis (Fig. 3). Spathegaster ovipositors do not vary. The Neuroterus ovipositor has a hook-shaped point, and can therefore never penetrate perpendicularly into a bud. The Spathegaster ovipositor, being only slightly curved, can pierce vertically the surface of the leaf.
What to read after Alternating Generations; a Biological Study of Oak Galls And Gall Flies?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Adler to read onlineMoreLess
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