. Smithsonian miscellaneous collections. known as the mouth parts includes thelabrum (fig. 2B, Lm), a pair of jawlike mandibles (Md), a pairof maxillae (D, Mx), a single posterior labium (Lb), and, enclosedby these parts, a median tonguelike organ called the hypopharynx (E,Hphy). The flattened, strongly toothed mandibles, shown detached atE of figure 2 (Md, Md), lie in a transverse plane immediately behindthe clypeus and labrum. Behind the mandibles are the maxillae (D,E, Mx). Each maxilla has a large basal part that bears a five-segmented lateral palpus (E, Pip), and two terminal lobes, thega
. Smithsonian miscellaneous collections. known as the mouth parts includes thelabrum (fig. 2B, Lm), a pair of jawlike mandibles (Md), a pairof maxillae (D, Mx), a single posterior labium (Lb), and, enclosedby these parts, a median tonguelike organ called the hypopharynx (E,Hphy). The flattened, strongly toothed mandibles, shown detached atE of figure 2 (Md, Md), lie in a transverse plane immediately behindthe clypeus and labrum. Behind the mandibles are the maxillae (D,E, Mx). Each maxilla has a large basal part that bears a five-segmented lateral palpus (E, Pip), and two terminal lobes, thegalea (Ga) and the lacinia (Lc) ; the base is subdivided into a proxi-mal cardo (D, E, Cd), and a main stalk, or stipes (St). The labiumis best seen on the back of the head (D, Lb) ; its two basal plates,the submentum (Smt) and mentum (Mt), collectively the post-mentum, lie in the rear wall of the head, but the inflected marginsof the submentum partly overlap the cardines and stipites of the SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4. Fig. 2.—Head and mouth parts of a cockroach, Blattella gcrmanica (L.) A, lateral view of the head suspended by the neck on the body in position ofrepose. B, facial view of head. C, tentorium, dorsal surface. D, posteriorview of head. E, the mouth parts separated from head and spread out inapproximately relative positions, showing anterior surfaces. Ant, antenna; at, anterior tentorial pit; Cd, cardo; Clp, clypeus; cvs, neck(cervical) sclerite; E, compound eye; For, neck foramen (foramen magnum, oroccipital foramen) ; Fr, frontal region (frons) ; Ga, galea; Hphy, hypopharynx;Lb, labium; LbPlp, labial palpus; Lc, lacinia; Lig, ligula; Lm, labrum; Md,mandible; Mt, mentum; Mth, mouth; Mx, maxilla; MxPlp, maxillary palpus;Pip, palpus; Prmt, prementum; Prstm, prestomum; pt, posterior tentorial pit;SIO, orifice of salivary duct; Smt, submentum; St, stipes; Th, thorax; Vx,vertex; y, oral arm from base of hypopharynx. NO. 7 BITING AND SUCKING INSECTS S
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
