. Economic entomology for the THE INSECT WORLD. 377 out devouring any part of its vegetable envelope, changes to a pupa, and emerges from the gall, leaving it intact, except for the hole through which it emerged. It seems, therefore, as if certain abnormal plant ex- udations secreted in the 433- gall form the actual food of the larva, and it is a curious and interesting fact that the same species in- variably produces in the same place the same kind of gall. In other words, the appearance of the gall is an unfaiHng index for An oak gaii-fly. the special student to the species that ma
. Economic entomology for the THE INSECT WORLD. 377 out devouring any part of its vegetable envelope, changes to a pupa, and emerges from the gall, leaving it intact, except for the hole through which it emerged. It seems, therefore, as if certain abnormal plant ex- udations secreted in the 433- gall form the actual food of the larva, and it is a curious and interesting fact that the same species in- variably produces in the same place the same kind of gall. In other words, the appearance of the gall is an unfaiHng index for An oak gaii-fly. the special student to the species that made it. Many interesting problems are connected with the study of these gall-flies ; for instance, in some species both sexes are present early in the season, but in the second or midsummer brood females alone make their appearance. The Fig. 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
