. Bulletin. Natural history; Natural history. 14 Illinois Natural History Survey Bulletin Vol. 33, Art. 1. Fig. 17.—Canopy trap used in collecting tabanids. Fig. 18.—One type of collecting head used with a canopy 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division

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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory