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Dear Friends,
On page 21 of the volume 5 "Catalogue Palaearct. Diptera", original reference of Rhagio albipilosus Becker,1921 is given as "Z. wiss. InsekBiol. 2: 47".
Becker's publication has not been listed in the Catalogue (vol.5).
Volumes of Zeitschrift für wissenschaftliche Insektenbiologie can be downloaded in the site Biodiversity Heritage Library. Date of publication of the Volume 2 is 1906, not "1921". Page 47 contains another article, not description of "Rhagio albipilosus Becker".

Now, where and when the species "Rhagio albipilosus Becker" has been published? Who can help me on this matter? Thanks a lot. Ahmet O.Kocak