Cryptophasa diplosema is a moth in the Xyloryctidae family. It was described by Lower in 1903. It is found in Australia, where it has been recorded from Queensland. The wingspan is 40-50 mm. The forewings are reddish-ochreous, much paler in males. The costa is moderately pale fleshy white, from the base to two-thirds, broadest on the basal portion. There is a deep red somewhat quadrate patch on the inner margin at one-sixth, reaching half across the wing. A similar patch is found at about the middle and there is a thick, deep red streak from the upper edge of the first spot, longitudinally continued to beyond the second spot. The markings are very obscure in females. The hindwings are orange.