The elements of insect anatomy; The elements of insect anatomy; an outline for the use of students in entomological laboratories elementsofinsect00coms Year: 1910 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 i
The elements of insect anatomy; The elements of insect anatomy; an outline for the use of students in entomological laboratories elementsofinsect00coms Year: 1910 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 wing.' 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 genera.
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