Available information about the bees of the genus Colletes from China is summarized. Currently, 66 species are recorded from China, of which two species, Colletes linzhiensis sp. nov. and C. spinatus sp. nov., are described as new. Type specimens are deposited in the Insect Collection of the Institute of Zoology, Chinese Academy of Sciences, Beijing, China. Thirteen species are recorded for Chi...

HARRIS [1933] concluded from the results of biological tests that only about one-third of the material in Jensen rat sarcoma which reduces 2:6-dichlorophenolindophenol is ascorbic acid. Later Young & Mitolo [1934] and Mitolo [1934] brought forward evidence which they believed to indicate that brain tissue also contains an indophenol-reducing factor (I.F.) which is not ascorbic acid. Recent inve...