Source : Webster's Revised Unabridged Dictionary (1913)

Urbicolae \Ur*bic"o*l[ae]\, n. pl. [NL., fr. L. urbs, urbis, a
   city + colere to inhabit.] (Zo["o]l.)
   An extensive family of butterflies, including those known as
   skippers ({Hesperiad[ae]}).