VII. Illustrations of the 6th ♂ ventral segment in 17 Osmia-spedcs of the adunca,-Group, with a Note on the synonymy of four species, and descriptions of four which seem new. Francis David Morice, M.A., F.E.S
Published in Transactions of The Royal Entomological Society of London, in 1901, in volume 49, pages 161-178
Date published:1901