. A text-book of agricultural zoology. Zoology, Economic. Pig. 60.—Mouth Parts of Insect3. A, Biting mouth parts; b, sucking, and o, piercing mouths: I, upper lip; m, man- dibles ; ma:, maxillEe; mp, maxillary palpi; Za, lower lip; Zp, labial palpi; a^i, an- tennae. (Nicholson.) prevents those insects possessing it from doing any damage. Those groups with this latter type of oral structure aid more or less in the fertilisation of plants. It will be chiefly, then, amongst the biting and piercing mouthed insects that the injurious species will be found. But we must bear in mind that the suctoria

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. A text-book of agricultural zoology. Zoology, Economic. Pig. 60.—Mouth Parts of Insect3. A, Biting mouth parts; b, sucking, and o, piercing mouths: I, upper lip; m, man- dibles ; ma:, maxillEe; mp, maxillary palpi; Za, lower lip; Zp, labial palpi; a^i, an- tennae. (Nicholson.) prevents those insects possessing it from doing any damage. Those groups with this latter type of oral structure aid more or less in the fertilisation of plants. It will be chiefly, then, amongst the biting and piercing mouthed insects that the injurious species will be found. But we must bear in mind that the suctorial mouthed insects have mandibulate larvae, which can do as much damage as the true mandibulate groups. Many insects are distinctly beneficial by destroying other noxious insects, and a few are of no inconsiderable commercial value.. 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.. Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons

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