Fig. 7. Colour triangles for the blue, green and red receptor colour space of Papilio spp. on the basis of different assumptions about the receptors involved and their polarisation preference angles . The anatomical receptor types assumed to be involved are listed on the right, and assumed values of are given at the corners of the triangles with the respective receptor names. For receptor nomenclature, see Fig.1 and Table1. Coloured circles show the colour loci of the stimuli used in oviposition and feeding tests (B, blue used in feeding tests; R, red used in feeding test; for the other colours and for the spectral curves, see Fig.2). Two connected circles show the position of stimuli with the same spectral distribution (hence the same colour of the circle) but different polarisation angle (vertical, v; horizontal, h). PS, polarisation sensitivity (see Table 1).