L. exilis  small, slender, thin  < ex  without; ile, ilis  intestines.
ex “Minute Bittern” (= ♀) and “Mexican Bittern” of Latham 1785 (Ixobrychus).
● ex “Hummingbird of a black colour” of Bancroft 1769, and “Little Humming Bird” of Latham 1782 (subsp. Orthorhyncus cristatus).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com on 12 December 2018).