Udea nigrescens is a moth of the family Crambidae. It is endemic to the Hawaiian islands of Kauai, Oahu, Molokai and Maui.
The larvae feed on Abutilon species, Sida cordifolia and Sida rhombifolia.
. Elwood Zimmerman . 1958 . Insects of Hawaii . 8 Lepidoptera: Pyraloidea . University of Hawaii Press. 10125/7337 .