. Smithsonian miscellaneous collections. her part of the maxilla (see figure 4B). The maxillarylobe of the flea must be largely the stipes, since it bears the palpus andcontains the palpus muscles in addition to the lacinial muscle. Thegalea is either absent or indistinguishably united with the stipes. The labium of the flea (fig. 34 J) is a relatively simple appendagesupported at its base on the small peglike sclerite (b) above mentionedprojecting upward from the hypostomal margin between the laciniallevers (C). The labium consists of an elongate basal lobe, and oftwo slender distal palpi hel
. Smithsonian miscellaneous collections. her part of the maxilla (see figure 4B). The maxillarylobe of the flea must be largely the stipes, since it bears the palpus andcontains the palpus muscles in addition to the lacinial muscle. Thegalea is either absent or indistinguishably united with the stipes. The labium of the flea (fig. 34 J) is a relatively simple appendagesupported at its base on the small peglike sclerite (b) above mentionedprojecting upward from the hypostomal margin between the laciniallevers (C). The labium consists of an elongate basal lobe, and oftwo slender distal palpi held close together. In Pulex irritans thelabial palpi are three-segmented, in other species they may have fromtwo to five segments. The basal part of the labium is deeply groovedon its anterior surface for the reception of the median and pairedstylets; the tips of the palpi extend slightly beyond the latter. The unpaired stylet of the fleas mouth parts is a slender, slightlysinuous rod (fig. 34 I), armed along its anterior edge with a row. Fig. 34.—The head and feeding organs of a flea, Pulex irritans L. OrderSiphonaptera. A, head and mouth parts, left side. B, same, anterior view, more , membranous area of the peristome, and bases of mouth parts implanted init, as seen from inside the head. D, right maxilla, mesal view, showing relationof lacinia to maxillary lobe. E, median sectional view of anterior part of headshowing sucking and salivary-ejection apparatus. F, maxillary lobe and , maxillary lacinia. H, inner view of labrum and floor of sucking pump (Sit),with base of hypopharynx turned to one side. I, exposed part of hypopharynx,lateral. J, labium, anterior. a, margin of peristome; Ant, antenna; b, sclerite supporting labium on hypo-stomal margin of peristome; c, infolded distal margin of clypeus ; CbP, cibarialpump; d, hypopharyngeal plate giving attachment to muscles of salivary pump;c, tapering process behind base of hypopharynx, apparently containing
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
