Arculus definitions

arculus

A crossvein between the radius and cubitus near the base of the wing in certain insects.
Found on http://en.wikipedia.org/wiki/Glossary_of_entomology_terms

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arculus

Small crossvein near base of wing
Found on http://entomology.ifas.ufl.edu/choate/insectclass/glossary_terms.htm

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Arculus

In adult Odonata, an arch-shaped vein connecting radius and median near base of wing, forming an elongate triangle between them.
Found on http://www.geog.ubc.ca/biodiversity/efauna/InsectGlossary.html

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