Public Health Bulletin

Cover Public Health Bulletin
Public Health Bulletin
United States. Public Health Service
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Rostrum, paired portion.
4. Rostrum, unpaired portion.
5. Maxilla.
6. Maxillary palpus.
7. Salivary grooves.
Digitized by VjOOQIC Plate I.
MOUTH PARTS OF CERATOPHYLLUS FASCIATUS.
Digitized by VjOOQIC Digitized by VjOOQIC 131 8. Basal element of rostrum.
9. Basal element of mandibles.
10. Salivary pimip.
11. Salivary duct.
12. Vertical portion, aspiratory canal.
13. Longitudinal portion, aspiratory canal.
14. Oesophagus.
15. Oesophageal ganglia.
16. Muscles operating aspiratory canal.
17. Hypoph
...arynx.
18. Muscles operating salivary pump.
19. Ligament connecting hyjwpharynx with floor of aspiratory canal.
THE ACT OF BITING.
The epipharynx,or pricker, makes an opening into the skin, through which the mandibles are inserted. These organs, by meaAS of their serrations and independent movement, then enlarge the opening as with a saw, permitting them, with the epipharynx, to pass deeper and deeper imtil the points of the maxilla rest upon the cutaneous surface. The labial palpi serve as a protective case when the organs are not in action.


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