. The butterflies of the British Isles. Butterflies. 12 THE BUTTERFLIES OF THE BRITISH ISLES. Swallow-tail butterfly. The point of attachment with the thorax is the base of the wing, and the edge farthest from the base is the outer margin (tertnen) ; the upper edge, or front margin, is the costa ; and the lower edge is the inner margin (dorsum). The point where the upper margin meets the outer margin on the fore wing is the apex, but on the hind wing it is called the outer angle ; the angle formed by the junction of outer and inner margins is the inner angle of the fore wing, but the anal angl
. The butterflies of the British Isles. Butterflies. 12 THE BUTTERFLIES OF THE BRITISH ISLES. Swallow-tail butterfly. The point of attachment with the thorax is the base of the wing, and the edge farthest from the base is the outer margin (tertnen) ; the upper edge, or front margin, is the costa ; and the lower edge is the inner margin (dorsum). The point where the upper margin meets the outer margin on the fore wing is the apex, but on the hind wing it is called the outer angle ; the angle formed by the junction of outer and inner margins is the inner angle of the fore wing, but the anal angle of. tad l/ouriaL angle. Fig. 9. Butterflies' "Wings. the hind wing. The term tornus is sometimes used for this angle on either wing. Dividing the wings transversely into three portions, we have three areas, termed respectively basal, central or discal, and outer. These are terms used in descrip- tions of butterflies, and it will be useful to remember them. The ribs of a butterfly's wings are by some authors described as veins, whilst others style the main ones nervures, and the branches nervules. Fig. 9, B, represents the venation, or neuration of the Black-veined White, and the numeral system. 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 South, Richard. London : F. Warne
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbutterf, bookyear1906
