This species has multiple forms ,several are seen in Tanzania; Fasciicollis,Purpurascens,Marginipennis and Brunneipennis. The name derives from the male head looking like Neptunes trident.
All the forms are beautiful
Fasciicollis form - the black pigment varies between each specimen
Tanzania
1 pair A1 £ 7.50 , M 35mm +/- (female has no horn)