Notes on Utah syrphidae - Knowlton, G. F.; Pack, H. J.
Sobretiro de Pan-Pacific entomologist 6 (4): 182-189, 1930. Encuadernado con: Notes on american two-winged flies of the family sapromyzidae/by J. R. Malloch 74-61
Keywords: Dípteros Syrphidae -- Utah