lortii is the north-eastern form of Lilac-breasted Roller. This individual still shows traces of lilac on its breast so is probably an intergrade between lortii and the nominate
Alcedo quadribrachys(1) A. q. quadribrachys Bonaparte, 1850 (top)(2) A. q. guentheri Sharpe, 1892 (bottom)Illustration source: Pl. IV in Catalogue of the Birds in the British Museum, Vol. XVII, by Keulemans, J.G., 1874http://commons.wikimedia.org/wiki/File:AlcedoKeulemans.jpg