||The database: The butterflies (Hesperioidea and Papilionoidea, Lepidoptera) of East Europe. http://determix.com/en/product.php Authors of the database: Igor G. Pljushtch, Dmytri V. Morgun, Kirill E. Dovgailo, Nicolai I. Rubin, Igor A. Solodovnikov. This work is the complete survey and identification guide to 319 species (378 taxa are considered in details, including subspecies) of butterflies, occurring in Norway (Finnmark Province), Finland, Estonia, Latvia, Lithuania, Romania, Slovakia, Hungary, Belarus, Poland, Ukraine, Moldavia, European Russia (including all North Caucasus administrative units), and Western Kazakhstan (Ural and Atyrau Regions). The work includes additionally the list of 13 species possibly published erroneously for this area in old literature sources, belonged to the end of 19th - beginning of the 20th century. Based on our research we consider the inhabitation of these species on the study area does not confirmed by the available museum and new factual materials. ISBN: 985-90000-6-9 The task to survey fauna, taxonomy, biology and ecology of such big and complex group as butterflies for the vast area of Eastern Europe was realized in this database thanking to the unity of efforts of five researchers from Ukraine, Russia, and Belarus: Igor Georgievich Pljushtch (Kiev, Ukraine), Dmytri Vladimirovich Morgun (Moscow, Russia), Kirill Yevgen'evich Dovgailo (Minsk, Belarus), Nikolai Isaakovich Rubin (Grodno, Belarus), Igor Al'bertovich Solodovnikov (Vitsebsk, Belarus) The work runned by the following way. Several taxonomic lists of day butterflies, widely accepted in Russian lepidopterological school, were taken. All authors suggested their opinion and modifications, which were discussed and included in our list at the meeting of co-authors. Thus the original list of Eastern European taxa was compiled. The articles about common species were created jointly. The original data on biology and distribution of butterflies in Ukraine, Romania, Moldavia, Russian North Caucasus, and Finnmark province of Norway were composed mainly by Igor Georgievich Pljushtch. The detailed collection of faunistic data, summaries on biology of butterflies from European and North Caucasian Russia, North-West Kazakhstan were done by Dmytri Vladimirovich Morgun. The data from Belarus, Finland, and some regions of SE European Russia, NW Kazakhstan were prepared by Kirill Yevgen'evich Dovgailo. The work on data collection on fauna and biology of butterflies from Belarus, Baltic countries, Republic of Crimea (Ukraine), Slovakia, NW Kazakhstan - Igor Al'bertovich Solodovnikov. The data on species living in Poland, Belarus, and in big degree Crimea were prepared by Nikolai Isaakovich Rubin. Species mapping was carried out by each author in frames of regions as described above, and based on original and other data. Lysandra software - a taxonomic identification software for creating databases for groups of living organisms. (c) 2006-2011, K.E. Dovgailo, the software "Lysandra", database, all digital date and digital images.