Contribution to the butterfly fauna of Sichuan, China (Hesperioidea, Papilionoidea)

The results of two Lepidopterological expeditions to Sichuan, China in 2009 and 2010 are presented. All butterfly and skipper species, observed during the expeditions, are recorded per locality and altitude. Some taxa are reviewed for reasons of taxonomy, distribution, or scarcity. In the altitudinal observations we discuss the composition of species of the family-group taxa. The faunal similarity between the different altitudinal classes in Jiuzhaigou is calculated. Pieris davidina Oberthür, 1891, syn. n. is synonymized with Sinopieris venata (Leech, 1891).