. Smithsonian miscellaneous collections. e, the lacinia has been lost in the majority ofspecies, and the persisting maxillary lobe is the galea. The use of thelacinial forks is not known, but their position and musculaturesuggest that they serve as picks. The labium of the Mallophaga is always a simple structure, con-sisting of a broad plate in the under wall of the head (fig. 11 A, D,Lb) bearing two or four small terminal lobes. The simplicity of thelabium is in line with the simplification of the organ in the mallophagan labium can play only a passive role in feeding. The hyp
. Smithsonian miscellaneous collections. e, the lacinia has been lost in the majority ofspecies, and the persisting maxillary lobe is the galea. The use of thelacinial forks is not known, but their position and musculaturesuggest that they serve as picks. The labium of the Mallophaga is always a simple structure, con-sisting of a broad plate in the under wall of the head (fig. 11 A, D,Lb) bearing two or four small terminal lobes. The simplicity of thelabium is in line with the simplification of the organ in the mallophagan labium can play only a passive role in feeding. The hypopharynx has the same essential structure in the Mal-lophaga as in the Corrodentia. In most species a variously developedbut typically cup-shaped sitophore sclerite lies in the dorsal surfacejust before the mouth; more distally on the ventral surface is a pairof ovoid sclerites (fig. 11 F, H) ; and, connecting the two, a forkedfilament (cf) runs forward from the sitophore, and its branches no. 7 BITING AND SUCKING INSECTS—SNODGRASS 27. Fig. 11.—Head and mouth parts of biting lice. Order Mallophaga. A, head of Lacmobothrion sp., ventral. B, mandibles of same, ventral. C,maxilla of Lacmobothrion gypsis Kellogg. D, labium and maxillae of Ancis-trona vagelli (F.), ventral. E, sitophore sclerite on base of hypopharynx ofDocophoroidcs brevis (Dufour), dorsal. F, hypopharyngeal sclerites of Laemo-bothrion gypsis Kellogg, ventral (hypopharynx itself not shown). G, maxillaryfork (lacinia) of Ancistrona vagelli (F.). H, hypopharyngeal sclerites of Doco-phoroidcs brevis (Dufour), ventral. I, sitophore sclerite of hypopharynx ofAncistrona vagelli (F.). J, apical armature of hypopharynx of Gliricola por-edli (L.) (from Ewing, 1924). a, distal arm of sitophore sclerite; Ant, antenna; ap, apodeme of lingualsclerite ; cf, connecting filament; Ga, galea ; Lb, labium ; Lc, lacinia ; Lm, labrum ;Is, lingual sclerite; Md, mandible; MxPlp, maxillary palpus; Pip, palpus; Sit,sitophore; St, stipe
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