Note 7 — Chapter IX
Reading edition
Figure 111 represents the parts of the mouth in a large specimen of Pediculus vestimenti, entirely protruding, and seen from above, magnified one hundred and sixty times; aa, the summit of the head with four bristles on each side; bb, the chitinous band, and c, the hind part of the lower lip, such as they appear through the skin by strong transmitted light; dd, the foremost protruding part of the lower lip (the haustellum); ee, the hooks turned outwards; f, the inner tube of suction, slightly bent and twisted; the two pairs of jaws are perceived on the outside as thin lines; a few blood globules are seen in the interior of the tube.