. Economic entomology for the 378 AN ECONOMIC ENTOMOLOGY. Fig. 435. any evidence at present, there is a continuous breeding by female individuals only. There are only a very few injurious species among these gall- flies. Occasionally we find on blackberry stems an irregular, warty swelling, and if this be cut into, it will be found full of cells occupied by these little Cynipid larvae. This kind of gall is known as " multicellular," be- cause inhabited by nu- m e r o u s specimens. Similar galls are found on the roots of rose and plants of the same natural family, and in a
. Economic entomology for the 378 AN ECONOMIC ENTOMOLOGY. Fig. 435. any evidence at present, there is a continuous breeding by female individuals only. There are only a very few injurious species among these gall- flies. Occasionally we find on blackberry stems an irregular, warty swelling, and if this be cut into, it will be found full of cells occupied by these little Cynipid larvae. This kind of gall is known as " multicellular," be- cause inhabited by nu- m e r o u s specimens. Similar galls are found on the roots of rose and plants of the same natural family, and in a few other cases cul- tivated plants become subject to gall growths. As a matter of fact these galls are scarcely injurious, because in most cases the plant continues growing be- yond them, or even if a shoot is lost, perma- nent injury is rarely done. Certain species of oak-galls produce a black stain, and these were at one time al- most universally employed in making an ink of remarkable per- manence. Even yet the law in some States requires for certain records an ink of which oak-galls is one of the ingredients. It is a small step from parasitism upon vegetation to parasit- ism upon animals, and hence it is not surprising to find that some species of this family are parasitic on other insects. The differ- ences between these forms and the true gall-makers are not easily. c, Pithy gall on blackbern 7iebulosus; b, section to show cells pupa. made by Diastrophus larva. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, John B. [from old catalog]. [n. p. ]
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublishernp, bookyear1896
