A possible interpretation within the provided context.

The nominate subspecies is known from northern India (Sikkim, Darjeeling) and Nepal.
A revised annotated and distributional checklist of Chinese Andraca ... by Wang, Xing; Wang, Min; Dai, Liang-Ying; Zolotuhin, Vadim V. / Florida Entomologist
The nominate subspecies is geographically the closest to Puerto Rico.
First record of Aplomado Falcon (Falco femoralis) for the west indies by Mathys, Blake A. / The Wilson Journal of Ornithology
The bird photographed at Palau also appears to be an example of the nominate subspecies (photographs examined by DWB and Doug Pratt).
Range expansion of the white-breasted Waterhen (Amaurornis ... by Buden, Donald W.; Retogral, Stanley / The Wilson Journal of Ornithology

http://www.thefreedictionary.com/Nominate subspecies

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Note added at 4 hrs (2015-04-14 11:26:45 GMT)
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In zoological nomenclature, when a species is split into subspecies, the originally described population is retained as the "nominotypical subspecies"[3] or "nominate subspecies", which repeats the same name as the species. For example, Motacilla alba alba (often abbreviated Motacilla a. alba) is the nominotypical subspecies of the white wagtail (Motacilla alba).
http://en.wikipedia.org/wiki/Subspecies