Maui Masked Bee (Hylaeus mauiensis)  

The Maui Masked Bee is known from only two specimens which had been collected in 1899 in the wet mountain rainforests of eastern Maui, Hawaiian Islands, one of these two specimens, a female, is no apparently lost.

The species might well be extinct, however, the locality were the specimens were collected lie within a natural reserve, the mountainous areas of Maui are difficult to access and there have not been any true search efforts, thus this species may sometimes be rediscovered. [1] 

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References:  

[1] Howell V. Daly; Elwood Curtin Zimmerman; Karl N. Magnacca: ‘Insects of Hawaii; Volume 17; Hawaiian Hylaeus (Nesoprosopis) Bees (Hymenoptera, Apoidea). 2003 
[2] K. N. Magnacca: Species Profile: Hylaeus mauiensis. In Shepherd, M. D. M. Vaughan, and S. H. Black (Eds.) Red List of Pollinator Insects of North America. The Xerces Society for Invertebrate Conservation, Portland, Oregon 2005

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edited: 12.06.2020