Clypeal suture: marks the division between clypeus and epicranium. [Please select]
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Supra-clypeal mark: in bees; a patch of light color above the clypeus. [Please select]
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The head is longer vertically than horizontally, the frontal, or clypeal region is broad, and greater in extent than the epicranio-occipital region. [Please select]
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Sub-clypeal pump: in some Diptera, the enlarged, more or less bulb- like structure at the anterior entrance of the oesophagus. [Please select]
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