. The elements of insect anatomy; an outline for the use of students in entomological laboratories. 103 The method of specialization of wing-veins which has taken place in the Hymenoptera can be most easily seen by a study of the fore wings of certain sawflies. The most use- ful for this purpose that we have found belong to the genera Pamphilius and Macroxyela. If we are right in our interpre- tation of the wings of these insects, there is preserved in each genus all of the primitive wing-veins with a single ex- ception. And, as in each of these genera a different vein is lost, we are able to
. The elements of insect anatomy; an outline for the use of students in entomological laboratories. 103 The method of specialization of wing-veins which has taken place in the Hymenoptera can be most easily seen by a study of the fore wings of certain sawflies. The most use- ful for this purpose that we have found belong to the genera Pamphilius and Macroxyela. If we are right in our interpre- tation of the wings of these insects, there is preserved in each genus all of the primitive wing-veins with a single ex- ception. And, as in each of these genera a different vein is lost, we are able to make a figure of a typical wing from a Sf. FIG. 7.—The cells of a typical hymenopterous ; study of the two genera. Figures 6 and 7 represent such a wing ; in the former the veins are lettered ; in the latter, the In the wings of these sawflies the anal furrow and the median furrow are both well marked, and are in the typical positions ; that is, the anal furrow is immediately in front of the first anal vein, and the median furrow is in front of the * The cell lettered S is probably &-2. When it is thickened and opaque, as is frequently the case in this order, it is termed the stigma. t Figures 6 and 7 represent the venation of the fore wing of Pamphilius, except that vein /?,,, which is lacking in this genus, is added. This vein is well pre- served in Macroxyela, but in Macroxyela vein is lost. See Comstock. Manual for the Study of Insects, p. 606, tor figures of the wings of these two 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. Ithaca, N. Y. , Comstock Pub. Co.
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