. Smithsonian miscellaneous collections. der, and more or less decurved. The wall of the labium, as is well shown in Joblings cross sectionof the haustellum (fig. 31 F), is distinctly divided lengthwise into astrong posterior thecal section (The) and a deep anterior labial gutter(LG), the two parts being united by wide membranes deeply inflectedon each side. The labrum (Lm) is embraced by the elevated sidesof the gutter, and is held in place by interlocking ridges on theapposed surfaces of the two parts. The almost tubular channel ofthe labrum is the food canal (fc). Between the labrum and the
. Smithsonian miscellaneous collections. der, and more or less decurved. The wall of the labium, as is well shown in Joblings cross sectionof the haustellum (fig. 31 F), is distinctly divided lengthwise into astrong posterior thecal section (The) and a deep anterior labial gutter(LG), the two parts being united by wide membranes deeply inflectedon each side. The labrum (Lm) is embraced by the elevated sidesof the gutter, and is held in place by interlocking ridges on theapposed surfaces of the two parts. The almost tubular channel ofthe labrum is the food canal (fc). Between the labrum and the floorof the labial gutter lies the hypopharynx (Hphy), which is traversedby the salivary canal (sc). The long slender theca of the labium bears distally a pair of laterallabellar lobes (fig. 31 E, Lbl), the outer surfaces of which are hard,smooth plates, while the inner surfaces are membranous and supportan armature of strong teeth and associated sensory papillae (D).The teeth are everted and exposed externally (E, H) by the same6 -Prb. Fig. 31.—Head and feeding apparatus of Lynchia and Melophagus. A, Lynchia americana (Leach), head and exposed part of retracted proboscis,anterior. B , Melophagus oviims L., head and first two segments of thorax,ventral, proboscis retracted. C, same, head, proboscis protracted. D, Pscudo-lynchia canariensis (Macq.) (Lynchia maura Bigot), end view of labium,prestomal teeth introverted (from Jobling, 1926). E, same, distal part oflabium, lateral, prestomal teeth everted (from Jobling, 1926). F, same, crosssection through middle of proboscis (simplified from Jobling, 1926). G,Lynchia americana, proboscis retracted into pouch of head. H, Melophagusovinus, distal part of proboscis, dorsal, prestomal teeth everted (from Jobling,1926). I. Pscudolynchia canariensis, vertical section of head, proboscis protracted(from Jobling, 1926). Ant, antenna ; Ap, labral apodeme ; Br, brain ; CbP, cibarial pump ; dp, clypeus ;fc, food canal; Hphy, hypopharynx ; L
Size: 1372px × 1820px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
