Labrum
Explanation of Terms Used in Entomology · 1906 · p. 2
: the upper lip; covers the base of the mandible and forms the roof of the mouth.
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An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
An Illustrated Encyclopedic Medical Dictionary (1893)
Labrum-epipharynx
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Explanation of Terms Used in Entomology (1906)
Prae-labrum
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Explanation of Terms Used in Entomology (1906)
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