- Cucullia verbasci, 120.
- Curculionidæ, often protected by hard covering, 120; similar colours of two sexes, 114.
- Cuviera squamata, 258.
- Cyclopeplus batesii, 92.
- Cynopithecus, 196.
- Cynthia arsinoë, 172.
- Danaidæ, the subjects of mimicry, 85, 86.
- Danais erippus, 88; chysippus, 112; sobrina, 179; aglaia, 179; tytia, 180.
- Darwin, Mr., his principle of utility, 47; on cause of colour in flowers, 127, 262; on colours of caterpillars, 118; on sexual colouration, 260; his metaphors liable to misconception, 269; criticism of, in North British Review, 291.
- Desert animals, colours of, 49, 50.
- Diadema, species of, mimic Danaidæ, 86, 87; female with male colouration, 112.
- Diadema misippus, 112; D. anomala, 113.
- Diaphora mendica, 89.
- Dicnyodontia, 299.
- Dicrourus, 253.
- Diloba cœruleocephala, 120.
- Dimorphism, 145; in beetles, 155; in birds, 155; illustrated, 157.
- Dinosauria, 298.
- Diptera mimicking wasps and bees, 97.
- Doliops curculionides, 94.
- Domesticated animals, their essential difference from wild ones, 38-41.
- Dotterell, 251.
- Drusilla, mimicked by three genera, 181.
- Drusilla bioculata, 180.
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