Fig. 2. The eye shine patterns in the eyes of the satyrine Bicyclus
anynana (A), the heliconian Heliconius melpomene (B) and the
small white Pieris rapae (B) observed with the large-aperture optical
apparatus depicted in Fig. 1.
The ommatidia in the three species reflect either predominantly yellow or
predominantly red light. The red reflection is absent from a large dorsal area
of the eye of Bicyclus anynana and from a small dorsal area of the
eye of Pieris rapae; in Heliconius melpomene, both
reflection types co-exist throughout the eye. The central `hot spot' is due to
reflection on the lens surfaces of the microscope objective. The dark areas in
A and B are caused by specks of dust; the dark facets in C have a strong
deep-red reflection. The scale bars, 300 µm in A-C, refer to the central
part of the figures only because the optical apparatus suffers from slight
barrel-type distortion.
