Figure 4.

The variation in scute morphology. Dorsal views of males and SEMs of the lateral views of the cover scales from the iridescent regions. (a,b) Troides magellanus (Papilioninae: Papilionidae). (a) SEM showing horizontal (Hz) and vertical (Ve) diffracting scute tips from the iridescent blue dorsal regions. (b) Blue iridescence visible in backscatter. (c,d) Troides miranda (Papilioninae: Papilionidae). (d) SEM showing positions of scutes (Sc) and flutes (Fl) from scales in yellow regions. (e,f)Percnodaimon pluto (Satyrinae: Nymphalidae). (f) SEM showing tilted scutes from iridescent region on dorsal wings. (g,h) Eryphanis aesacus (Morphinae: Nymphalidae). (h) SEM showing flutes (Fl) and scutes (Sc). (i,j) Eroessa chiliensis (Pierinae: Pieridae). (j) Parallel continuous scutes in the orange regions.