Dewy Opogona Moth (Opogona irrorata)
The Dewy Opogona Moth was described in 1879; it is, or maybe was, endemic to the island of Saint Helena in the middle of the Atlantic Ocean.
The description of this species.:
“The fore wings of a pale brownish or straw-coloured tinge, and speckled with numerous irregular black dots (particularly on the basal half), each composed of a few dark scales, those near the costa having a faint tendency to be placed somewhat in transverse pairs. The apex and outer margin are speckled more minutely, as is also the fringe. Hind wings pale glossy cinereous, and, when viewed beneath a high magnifying-power, with a pearly and somewhat opaline lustre. Thorax slightly darker than the anterior wings; body much the same as the posterior ones.
The only examples which I have seen of this moth I captured, I believe, at Thompson’s Wood; but whether the species is in any way connected with the gumwoods I have no means of deciding. At any rate there is no reason to suspect that it is otherwise than truly indigenous in the island. The rather dotted, or speckled, surface of its upper wings will be sufficient to distinguish it from its more immediate allies.” 
The species was never found again and is quite likely extinct. 
 Mrs. T. Vernon Wollaston: Notes on the Lepidoptera of St. Helena, with descriptions of new species. The Annals and Magazine of Natural History, including Zoology, Botany, and Geology. Ser. 5. Vol. 3: 415-441. 1879
 Timm Karisch: Darwin-Plus Project DPLUS040: securing the future for St Helena’s endemic invertebrates. Report Lepidoptera. Dessau, 31.08.2018