Chroicocephalus

(syn. Larus Ϯ Black-headed Gull L. ridibundus) Gr. χρωικος khrōikos  coloured  < χρωζω khrōzō  to colour, to stain; -κεφαλος  -kephalos  -headed  < κεφαλη kephalē  head; "Chroicocephalus for a new subgenus under Larus, Linn., for the reception of such gulls as have the tarsi slender, thighs considerably denuded, hind toe very small, head only, or head and upper part of neck, dark-coloured in the summer state of plumage ...derived from two Greek words, κροικος, coloured, and κεφαλη, head; signifying that the birds classed under that name have coloured heads" (Eyton per Wharton 1878).  Var. Chroecocephalus, Chroeocephalus, Chroiococephalus, Chroiocephalus, Chraeococephalus, Chraecocephalus, Chroocephalus, Croicocephalus, Kroikocephalus, Kroicocephalus, Krokocephalus.

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).