or Querquctultanae virae, nymphs presiding over the green oak forests, near the porta querquetularia, or querquetulana, were believed to be possessed of prophetic powers. (Festus, p. 261, ed. Müller; Plin. Nat. 16.10, 15.37.) It should be observed that the word vira is the ancient feminine of vir, and signifies women. Hence virugo or viryo.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890