The Sangihe White-eye was described in 1888 based on a single specimen that was collected two years prior, it is, or maybe rather was, endemic to the island of Sangihe, Indonesia. This sole specimen was later thought to be lost but was rediscovered in 1990.
The species was later found out to be restricted to a tiny, higly threatened patch of remaining forest on this largely deforested island. As far as I know, the last confirmed record of this species was in February 1999, when a bird was heard singing, however, the bird itself was not seen. 
The Sangihe White-eye apparently now joins the ever-growing list of extinct species.
 P. C. Rasmussen; J. C. Wardill; F. R. Lambert; J. Riley: On the specific status of the sangihe White-eye Zosterops nehrkorni, and the taxonomy of the Black-crowned White-eye Z. atrifrons complex. Forktail 16: 69-80. 2000
The Marianne White-eye was described in 1867, it was known only from Marianne Island in the Seychelles but may as well have occured on other islands within the island group including La Digue, Mahé, Praslin, and Silhouette.
The species was originally thougth to be a subspecies of the Mayotte White-eye (Zosterops mayottensisSchlegel) which it closely resembles, it is, however, more closely related to the Mascarene White-eye species and was restored to a full species in 2006.
The species disappeared sometimes between 1870 and 1900, the reasons for its demise, however, appear to be unknown but very likely lay in habitat destruction through agricultural development.
 Justin Gerlach: Red List ing reveals the true state of biodiversity: a comprehensive assessment of Seychelles biodiversity. Phesluma 20: 9-22. 2012