. A classification of the larvae and puparia of the Syrphidae of Illinois, exclusive of aquatic forms. Syrphidae; Insects; Diptera; Larvae. ILLINOIS BIOLOGICAL MONOGRAPHS Vol. XVI No. 4. Published by the University of Illinois Under the Auspices of the Graduate School Urbana, Illinois. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Heiss, Elizabeth Madeleine, 1907-. Urbana, The University of Illinois press

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Keywords: ., bookcentury1900, booksubj, booksubjectdiptera, booksubjectinsects