. Elementary entomology. Insects. ANATOMY OF INSECTS - - EXTERNAL used, and their structure is so constant and characteristic in different groups as to furnish one of the best means of classification. Most of the orders possess one of the two main types of mouth-parts, those formed for biting (mandibulate), and those formed for sucking (suctorial, or haustellate). The bit- ing type, as found in the grasshopper, is the more typical, and will therefore be discussed first. The labruin, or up- per lip, is a simple flap projecting Over FIG. n. Mouth-parts of grasshopper, typical biting the upper pa
. Elementary entomology. Insects. ANATOMY OF INSECTS - - EXTERNAL used, and their structure is so constant and characteristic in different groups as to furnish one of the best means of classification. Most of the orders possess one of the two main types of mouth-parts, those formed for biting (mandibulate), and those formed for sucking (suctorial, or haustellate). The bit- ing type, as found in the grasshopper, is the more typical, and will therefore be discussed first. The labruin, or up- per lip, is a simple flap projecting Over FIG. n. Mouth-parts of grasshopper, typical biting the upper part of the or mandibulate mouth-parts Openin0" Of the mOUth //'>-, labrum, or upper lip ; md, mandible ; mx, maxilla ; lab, labium, or lower lip ; /, palpus ; g, galea; /, lacinia ; Kg, and covering the man- ligula. hyh hypopharynx dibles. It is hinged on the posterior margin, but otherwise is free and may be slightly protruded or retracted, to aid in bringing food to the 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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