. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies. Fig. 30.—Cross-section of the sucking-tube of the milkweed butterfly, to show the way in which the halves unite to form a central canal (c): tr, trachea, or air- tubes; n, nerves; m, mi, muscles of one side. (Magnified 125 diameters.) (Burgess.) the upper end of the proboscis, in the head, is a bulb-like en- largement, in the walls of which are inserted muscles which have. Fig. 31.—Longitudinal section of the head of the milkweed butterfly: cl, clypeus; mx, left maxilla, the right being remov
. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies. Fig. 30.—Cross-section of the sucking-tube of the milkweed butterfly, to show the way in which the halves unite to form a central canal (c): tr, trachea, or air- tubes; n, nerves; m, mi, muscles of one side. (Magnified 125 diameters.) (Burgess.) the upper end of the proboscis, in the head, is a bulb-like en- largement, in the walls of which are inserted muscles which have. Fig. 31.—Longitudinal section of the head of the milkweed butterfly: cl, clypeus; mx, left maxilla, the right being removed; mfl, floor of mouth; ce, oesophagus, or gullet; ov, mouth-valve; sd, salivary duct; dm and/w, dorsal and frontal muscles, which open the sac. (Magnified 20 diameters). (Burgess.) their origin on the inner wall of the head. When these muscles contract, the bulb-like cavity is enlarged, a vacuum is produced, '5. 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 Holland, W. J. (William Jacob), 1848-1932. New York, Doubleday & McClure co.
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectbutterflies
