The book follows the previous one on diurnal butterflies (Bělín V., 1999: Motýli České a Slovenské republiky aktivní ve dne. [Diurnal butterflies of the Czech and Slovak Republics.] One thousand species of 65 families occurring on the territory of both republics are shown on colour plates. Photographs of some caterpillars are added. The text includes short family characteristics, distributional data on species, present status of occurrence, biotope information, seasonality of imago as well as caterpillar and host plants. Both volumes then introduce all the butterfly families occurring on the territory of the Czech and Slovak Republics and provide their comprehensive (diurnal Lepidoptera) and selective (nocturnal Lepidoptera) pictorial review.