Eucoracias

(syn. Coracias Ϯ Rufous-crowned Roller C. naevius mosambicus) Gr. ευ eu  fine; genus Coracias Linnaeus, 1758, roller; "Oberholser (Proc. U. S. Nat. Mus. XXVIII. 859, 1905) has separated the species of Coracias into two genera, reviving the name of Coraciura for the second one. A still further division should be made on the characters of wing and tail, not to mention the colour characters which lend support thereto, and I propose to place them as follows:  
1. Outer tail feathers not prolonged:
A. Outermost primary longer than the fourth: Coracias.  
B. Outermost primary shorter than the fifth: EUCORACIAS gen. nov., type Coracias mosambicus Dresser.    
2. Outer tail feathers prolonged:
A. Long tail feathers pointed: Coraciura Bp.  
B. Long tail feathers spatulate: TRIMENORNIS gen.nov., type Coracias spatulatus Trimen." (A. Roberts 1922).

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).