. A manual for the study of insects. Insects. 620 THE STUD V OF INSECTS, States is a bullet-like gall, which is attached to the small twigs, and which measures from one half to two thirds inch in diameter. In this gall the central kernel is surrounded by a hard, woody substance. The Giant Oak-gall, Andricus calif or nicus (An^ri-cus cal-i-for^ni-cus.—This is the most common oak-gall of the Pacific coast. It is very abundant on the twigs and branches of the California white oak, and during the winter, when the trees are bare, it is a very conspicuous object. It differs from the preceding galls
. A manual for the study of insects. Insects. 620 THE STUD V OF INSECTS, States is a bullet-like gall, which is attached to the small twigs, and which measures from one half to two thirds inch in diameter. In this gall the central kernel is surrounded by a hard, woody substance. The Giant Oak-gall, Andricus calif or nicus (An^ri-cus cal-i-for^ni-cus.—This is the most common oak-gall of the Pacific coast. It is very abundant on the twigs and branches of the California white oak, and during the winter, when the trees are bare, it is a very conspicuous object. It differs from the preceding galls in being of the type termed poly- thalamous; that is, instead of containing a single cell, there are several cells v/ithin it, in each of which a gall-fly is devel- oped. This gall varies greatly in form and size ; some of the larger ones measure ten or twelve inches in their greatest circumference. The outer surface of the gall is white, and usually smooth. The Pithy Blackberry-gall, Diastrophus nebulosus (Di-as'- tro-phus neb- u-1 o ' su s), is another exam- ple of a poly- thalamous gall. It is a large woody growth, which occurs on the stems of blackberry. It is sometimes three inches in length and one and one-half inches in diam- eter. It varies in shape, but Fig, 747.—The Mossy Rose-gall, Rhodites roscB. there afC al- ways several wrinkled ridges along 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
