. Bulletin. Natural history; Natural history. 288 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:IV wings, oftentimes the development of complex and characteristic genital structures, figs. 195, 242, the loss of fully developed gills where present in the nymphs, and sometimes degenerate, nonfunctional mouthparts. The specialized terminology of the wing veins is shown in fig. 171 and that of the genitalia in fig. 326. Other structures have approximately the same terminology as in the nymph. (See pp. 324, 326, 330, 418.). Fig. 5.—Map of Illinois. Each dot represents one or more localities at which
. Bulletin. Natural history; Natural history. 288 ILLINOIS NATURAL HISTORY SURVEY BULLETIN XX:IV wings, oftentimes the development of complex and characteristic genital structures, figs. 195, 242, the loss of fully developed gills where present in the nymphs, and sometimes degenerate, nonfunctional mouthparts. The specialized terminology of the wing veins is shown in fig. 171 and that of the genitalia in fig. 326. Other structures have approximately the same terminology as in the nymph. (See pp. 324, 326, 330, 418.). Fig. 5.—Map of Illinois. Each dot represents one or more localities at which stoneflies were collected dur- ing the course of this 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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