This photo shows two males of Bombus longipennis (Hymenoptera: Apidae) visiting Carduus acanthoides (Asteraceae). B. longipennis is distributed mainly in the mountainous areas of the eastern and southern Qinghai-Tibetan plateau with the mean elevation over 3 000 m, and plays a vital role as one of the important pollinators for many wild flowers and crops in this highland region. B. longipennis is one of the cryptic species of B. lucorum complex. In the 2nd issue (pp. 235-243) of 2014, a study of the molecular identification and distribution characteristics of B. lucorum complex in China was reported. Photo by HUANG Jia-Xing at the Liancheng National Natural Reserve, Gansu, China, in July, 2009.