. 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): //', tracheae, or air- tubes; ;/, nerves; m, in3, 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; tnx, left maxilla, the right bein
. 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): //', tracheae, or air- tubes; ;/, nerves; m, in3, 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; tnx, left maxilla, the right being removed; iiifl, floor of mouth; ce, oesophagus, or gullet; ov, mouth-valve; s^, salivary duct; dm and/;«, dorsal and frontal muscles, wiiicli 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, 15. 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, Page & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbutterf, bookyear1904
