Hmmm...a shot in the dark here, but this is but one of a half-dozen examples that rather suddenly showed up at the UV light. Not sure what it is. Gregory Pohls and Aaron Hunt do not recognize this moth (pers. comm.). Jerry Fauske hazards an educated guess of Greya enchrysa (0194.1) based on good match with MPG distribution, timing and habitat (pers. comm., 18 May 2018). Could be. Or perhaps not. A record of this living specimen may be useful down-the-road, so I'll archive two images here for later expert attention.

"DISCUSSION.—Greya enchrysa may be easily distinguished from all other members of Greya by its usually immaculate, pale, golden yellow forewings, which have suggested its specific name. All other known members of this genus exhibit a forewing pattern to some degree, or bright white coloration as in G. subalba." from Davis, D.R., O. Pellmyr and J.N. Thompson. 1992. Biology and Systematics of Greya Busck and Tetragma, new genus. (Lepidoptera: Prodoxidae). Smithsonian Contributions to Zoology 524: 56. (See file:///C:/Users/Owner/Downloads/SCtZ-0524-Hi_res%20(1).pdf)