Sideridis turbida, the white colon, is a moth of the family Noctuidae, subfamily Hadeninae.
[2][3] Forewing drab grey, suffused brown, except along costa and inner margin, and in an oblique pale fascia-form submarginal area;the pale submarginal fascia externally throw's off pale teeth; a long black streak from base below cell: median vein white, with only a small white spot at end of cell and a minute black point above it: veins whitish with black terminal streaks in the intervals:hindwing dark greyish, fuscous.
suffusa Tutt is a melanic brown form common in Britain, occurring, but rarely, in the Alps; — ochracea Tutt is a brownish ochreous form, also rare, apparently, on the continent.
The larvae feed on various plants growing in sandy places, including dandelion and plantain.
[3][5][6] The English vernacular name refers to the only distinctive marking on the moth, a pair of white dots outward of the center of the forewing resembling a colon or joined into a > shape.