This seems like the best match for this grass-veneer. The dark V-shaped patch on this bright white moth seems characteristic of some/many individuals. Of course, it may be something quite unrelated!
http://mothphotographersgroup.msstate.edu/species.php?hodges=5418
http://www.co1bank.uoguelph.ca/index.php/Taxbrowser_Taxonpage?taxid=397702