Lewis & Short

vŏlūcra, ae, f. [volvo], a kind of worm or caterpillar that wraps itself up in vineleaves (called also convolvulus), Col. Arb. 15.
It is also called vŏlūcre, Plin. 17, 28, 47, § 265; and plur. volucres, Col. 10, 333.