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 h), whose appendicular nature is shown only by a median furrow and by short, cylindrical palps (fig.
They are broad at the base, but taper towards the tip and carry palps (fig.
The maxillary palps have usually three, the labial either two or four segments.
The palps, both maxillary and labial, have two segments.
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