. A manual for the study of insects. Insects. 6o4 THE STUDY OF INSECTS. spect the homologous veins in the Lepidoptera and Diptera. In the Hymenoptera the tips of the branches of vein III coalesce with other vQins ; and when this coalescence has proceeded for a con- siderable distance towards the base of the wing, the branches may appear like cross-vems, instead of branches of a longitudinal vein. This result is very similar to what takes place in the more specialized Diptera. In Pamphiliis (Fig. 733) vein III2 is wanting; but this vein is present in Mac7'ox-yela (mac-rox-y-e'la) (Fig. 735). In
. A manual for the study of insects. Insects. 6o4 THE STUDY OF INSECTS. spect the homologous veins in the Lepidoptera and Diptera. In the Hymenoptera the tips of the branches of vein III coalesce with other vQins ; and when this coalescence has proceeded for a con- siderable distance towards the base of the wing, the branches may appear like cross-vems, instead of branches of a longitudinal vein. This result is very similar to what takes place in the more specialized Diptera. In Pamphiliis (Fig. 733) vein III2 is wanting; but this vein is present in Mac7'ox-yela (mac-rox-y-e'la) (Fig. 735). In both of these genera there is a cross-vein between veins IIIi and IIl2-f-5 (Fig. 733' <^"^j- -^ similar cross-vein exists in some crane-flies, dividing cell. ^-Ill4+,yj XII VIII Fig, 733.—Wings of a saw-fly, ramphilius^ with the veins numbered. nil into two parts (see Fig. 505). In both of these genera also the tips of veins III4 and III5 coalesce with vein Vi to such an ex- tent that these veins appear to be cross-veins. In the w4ng of the Honey-bee (Fig. 730) these veins are more obviously longitudinal veins. Vein V is very similar to the homologous vein in the Diptera. It arises from a cross-vein extending from vein III to vein VII. In Pa7nphilius it arises from near the costal end of this cross-vein; but in Apis (Fig. 730) its origin is near the middle of the cross-vein. In the Hymenoptera, however, the cross-vein III-VII is much farther from the base of the wing than it is in the Diptera. In the more. 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
