Noctua pronuba (Lepidoptera: Noctuidae)

Took this picture of a mating pair of what I think are large yellow underwing moths (Noctua pronuba).  We happened upon them while surveying at night for larvae of Hypolimnas octocula marianensis in the Pagat area of Yigo, Guam.  There were a also a lot of large sphingids buzzing around our headlamps.