. Text book of zoology. Zoology. 232 Arthropoda. lip and tliree pairs of jaws occur. The upper lip (labrum) is a broadj movable unpaired plate, situated in front of the mouth. Behind the labrum are the mandibles, which are Tery o. t^ C^v^ Fig. 195. Diagrams of the month parts of various Insects. A An Insect with h i t i n g mouth-parts, B a Butterfly, Oa Fly. 1 labrum, 2 mandible, 3 first maxilla, c cardo, s stipes, /' galea, /" lacinia, p^ palp. 4 Second maxilla=labium, c submentum, s mentum, /'glossa, /" paraglossa of Ugula, p palp, / proboscis of B and 0.—Orig. much like those of
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. Text book of zoology. Zoology. 232 Arthropoda. lip and tliree pairs of jaws occur. The upper lip (labrum) is a broadj movable unpaired plate, situated in front of the mouth. Behind the labrum are the mandibles, which are Tery o. t^ C^v^ Fig. 195. Diagrams of the month parts of various Insects. A An Insect with h i t i n g mouth-parts, B a Butterfly, Oa Fly. 1 labrum, 2 mandible, 3 first maxilla, c cardo, s stipes, /' galea, /" lacinia, p^ palp. 4 Second maxilla=labium, c submentum, s mentum, /'glossa, /" paraglossa of Ugula, p palp, / proboscis of B and 0.—Orig. much like those of the Crustacea in general structure, though as the palp is always wanting, each consists of a single, unsegniented_ piece, which can be moved inwards (towards the middle line) or outwards J its inner surface forms a cutting edge, and at its base. 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 work.. Boas, J. E. V. (Johan Erik Vesti), 1855-1935; Boas, J. E. V. (Johan Erik Vesti), 1855-1935. Lehrbuch der Zoologie. London, Sampson Low, Marston