. Elementary entomology. Entomology. HYMENOPTERA !47 and the abdomen is joined to tiie thorax by a slender petiole, or stalk, as in the fam- ilies named below, from which they are distinguished by lacking the dark spot, or stigma, toward the end of the anterior margin of the fore-wings. They have short, thick bodies, and the abdomen is com- monly compressed, so that the segments appear to be more or less telescoped. The mossy rose-gall [Rhociites rosae), which forms a large,. Fig. 389. Mossy rose-gall [Ix/ioditc-s ?vsae) (After Comstock) mosslike gall on the stems of roses, and the spongy oak-
. Elementary entomology. Entomology. HYMENOPTERA !47 and the abdomen is joined to tiie thorax by a slender petiole, or stalk, as in the fam- ilies named below, from which they are distinguished by lacking the dark spot, or stigma, toward the end of the anterior margin of the fore-wings. They have short, thick bodies, and the abdomen is com- monly compressed, so that the segments appear to be more or less telescoped. The mossy rose-gall [Rhociites rosae), which forms a large,. Fig. 389. Mossy rose-gall [Ix/ioditc-s ?vsae) (After Comstock) mosslike gall on the stems of roses, and the spongy oak-apple {AmpJiibolips spongifica), which looks like a puff-ball on the leaves and stems of oaks, are well-known examples. The adult flies may be easily reared by removing the galls from the plants when fully matured and placing them in any suitable receptacles. Only a few species are of economic importance on cultivated crops, among which may be men- tioned the pithy blackberry-gall {Diastrophus nebuIos7is), an irregular swelling two to three inches long on blackberry stems, inside which will be found numerous larvae, 3. PARASITIC HYMENOPTERA Most of the small, slender, wasplike hymen- optera, which are distinguishable from the true wasps by the two-segmented trochanters of the. 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882; Metcalf Collection (North Carolina State University). NCRS. Boston, Ginn
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
