(syn. Chrysococcyx Ϯ African Emerald Cuckoo C. cupreus) Gr. αδετος adetos free, unbound < negative prefix α- a- ; δεω deō to tie up; κοκκυξ kokkux, κοκκυγος kokkugos cuckoo; "Bannerman (Ibis, 1912, p. 244) has shown that two species of Emerald Cuckoo are commonly confused, the typical one being resident in West Africa and the other dispersed over Africa, occurring to the southernmost parts of the continent as a migrant. The migrant must bear the name Chrysococcyx intermedius Hartlaub; it differs in having the tail shorter in proportion to the wing, and may therefore be separated as a new subgenus under the name of ADETOCOCCYX." (A. Roberts 1922); "Adetococcyx (subgenus) Roberts, Ann. Transv. Mus., 8, 1922, p. 219. Type, by monotypy, Chrysococcyx intermedius Hartlaub [= Cuculus cupreus Shaw]." (Peters 1940, IV, 29).