You can go back to the other pictures.
The compound eyes (Compound eye: The eyes of many arthropods, including insects and crustaceans, are composed of anywhere from 12 to 1,000 facets called ommatidia. These are called compound eyes.) of a male Isonychia bicolor mayfly spinner.
Troutnut.com is a collection of pictures and information about fly fishing. Fly fishermen, fly tiers, and trout enthusiasts of all stripes can learn more about life beneath the surface of trout streams, as well as how to better imitate aquatic insects with artificial flies to catch trout. There are aquatic insect pictures, underwater pictures, landscape pictures, and a comprehensive reference to the common names of trout stream insects.
View Full Size