Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] HYMENOPTERA 247 and the abdomen is joined to the 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. The}' 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 (Rhodites rosae\ which forms a large, FlG. 389. Mossy rose-gall (Rhodites rosae) (After Comstock) moss
Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] HYMENOPTERA 247 and the abdomen is joined to the 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. The}' 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 (Rhodites rosae\ which forms a large, FlG. 389. Mossy rose-gall (Rhodites rosae) (After Comstock) mosslike gall on the stems of roses, and the spongy oak-apple (Amphibolips spongificd)y 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 (DiastropJius nebulosus), an irregular swelling two to three inches long on blackberry stems, inside which will be found numerous larvae. 3. PARASITIC HYMENOPTERA
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