PLATE LXX 



Figure 1 . The anterior end of the mid-gut of Pediculus vestimenti 

 with the salivary glands in situ, oes., oesophagus, 

 sl.d'., the duct of the reniform salivary gland, sl.d"., 

 the duct of the tubular gland, sl.g'., the reniform 

 salivary gland. sl.g"., the tubular glands. The 

 two anterior lobes of the mid-gut are shown, s.c., the 

 specialised cells lying around the oesophagus and the 

 ducts of the salivary glands. X 125. 



Figure 2. The specialised cells near the oesophagus, oes. Note 

 the marked distinction between these cells and those 

 of the fat body among which they lie. Compare with 

 figure 4 on Plate LXX I, which is drawn to the same 

 scale, x 550. 



Figure 3. Cells of the mid-gut, seen in a transverse section. 

 Note the unusual condition of the nucleus, n., the 

 collection of vacuoles near the lumen, v., and the well 

 denned striated border, c.mu., l.mu,, circular and 

 longitudinal muscle fibres, tr., trachea, x 900. 



Figure 4. A transverse section through the hind-gut, showing the 

 chitinous intima thrown into folds and furrows which 

 interlock with one another. X 270. 



Figure 5. A transverse section through the thorax of Pediculus, 

 passing through the anterior lobes of the mid-gut, 

 mg.d. ap., the apodeme formed by the union of the 

 two processes from the posterior part of the head, ha., 

 haematocoele. th.g., thoracic ganglion, mu., muscles 

 of the body wall, l.mu., longitudinal muscles. Other 

 letters as before. X 133. 



Figure 6. The alimentary canal of Pediculus vestimenti. c., 

 the little mass of specialised cells on the ventral wall 

 of the gut. h.g., hind-gut, ch.p., the chitinous plaques 

 which represent the rectal papillae. Other letters as 

 before, x 45. 



