. A classification of the larvae and puparia of the Syrphidae of Illinois, exclusive of aquatic forms. Syrphidae; Insects; Diptera; Larvae. 34 S. rectus 38 5, knabi. S. ribesii van. vlttafrons PLATE IV. 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