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. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Fol. 23, Art. 1 sides; ventro-mesal process of ninth tergite shorter and spatulate socia, p 4. Ventral margin of claspers produced into a slightly upturned lobe angustipennis, p Ventral margin of claspers not pro- duced, forming a rounded lobe e.g., feria 5 51 51. OBSCURA SOCIA. 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 work.. Illinois.

. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Fol. 23, Art. 1 sides; ventro-mesal process of ninth tergite shorter and spatulate socia, p 4. Ventral margin of claspers produced into a slightly upturned lobe angustipennis, p Ventral margin of claspers not pro- duced, forming a rounded lobe e.g., feria 5 51 51. OBSCURA SOCIA. 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 work.. Illinois. Stock Photo

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. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Fol. 23, Art. 1 sides; ventro-mesal process of ninth tergite shorter and spatulate socia, p 4. Ventral margin of claspers produced into a slightly upturned lobe angustipennis, p Ventral margin of claspers not pro- duced, forming a rounded lobe e.g., feria 5 51 51. OBSCURA SOCIA. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division

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RMRGWFEN–. Bulletin. Natural history; Natural history. Plate LXXIII. Topography corresponding to the soils shown in Plate LXXII. Con- tour interval 50 feet. Scale one inch to the mile. Arrows indicate streams.. 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 work.. Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division

RMRGWC4P–. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois as Psychomyia flavida, Hydropsyche bronta and Neotrichia okopa. Of greatest interest at the park is a very swift point in the river where the "leech- egg" cases of the hydroptilid Leucotiichia pictipes are found. These are attached at the sides of 30- to 50-pound boulders in the very center of the current. This is the only place in the state where this species has been found, and our only other nearby records are considerably to the north, in Wisconsin and Michigan. Gave Streams.—There are few c

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