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U. S. Bureau of Entomology
ROY E. CAMPBELL, W. M. DAVIDSON; NOTES ON APHIDOPHAGOUS SYRPHIDÆ OF SOUTHERN CALIFORNIA. Bulletin of the Southern California Academy of Sciences 1 March 1924; 23 (2): 59–74. doi: https://doi.org/10.3160/0038-3872-23.2.
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U. S. Bureau of Entomology