Uraniidae, [368], [419]

Uric acid pigments, [357]

Urodon, [278]

Uzel, on Thysanoptera, [527]

Vanessa, [352];

larva, [354]—see also Pyrameis and Araschnia

Vanessula, [356]

Vapourer-moths, [407]

Variation, of Anomma burmeisteri, [179];

of Bombus, [58];