Braun M 1885 (citation)- p 141-142 description of new species, Plate II, figure 4. Sekera E 1888 (citation) and/or (citation)- lists. Graff L v 1909 (citation)- description and illustration from Germany. Nasonov NV 1917 (citation)- brief mention of (in Russian). Luther A 1918 (citation)- records from Finland. Marcus E 1945 (citation)- close to and appoximately the same as S. cryptops and S. glandulosum. Luther A 1960 (citation)- brief mention of occurence and brief description.
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