Notes on the Rhinocypha cucullata Selys group from Borneo, with a description of R. viola spec. nov. (Zygoptera: Chlorocyphidae)

The new sp. from the central Kalimantan province of Borneo is described and figured. The original type series of R. cucullata Selys was examined and a 3 specimen is designated as lectotype. The single 9 syntype is shown to in fact be R. humeralis Selys. The true 9 R. cucullata is described and figured for the first time. Significant characters of R. aurofulgens Laidl. are figured for comparative purposes. Keys are provided to both sexes of the three species, comprising the extended cucullata group of F.F. Laidlaw (1950, Trans. R. ent. Soc. Land. 101: 233-269).