The Thysanoptera, small insects with firmly chitinized cuticle, are recognized by the combination of imperfectly suctorial jaws - the mandibles acting as piercers and maxillae retaining their palps (see fig.
2) on the h, Second maxillae, forming laextreme front of the head; they bium.
Behind the mouth the two maxillae of the second pair are intimately associated to form the labium (fig.
The maxillae of the first pair (fig.
Hinds believe that the paired piercers are the inner lobes of the maxillae, and the unpaired piercer the left mandible, the right mandible being absent.
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