. Bulletin. Natural history; Natural history. 152 Illinois Natiral History Survey Bulletin \'oI. 26, Art. 1 KEY TO GENKKA Amir Fore tarsus not more than thrcc-tourths as long as fore .47. Anepeorus Fore tarsus longer than fore tibia 2 Vein R«+i of hind wing unbranched, fig. 321 48. Arthroplea \ein of hind wing forked at or near center of wing, tigs. 317-320 3 First segment of fore tarsus as long as or longer than second 43. Epeorus First segment of fore tarsus shorter than second ^ Stigmatic crossveins of fore wing anasto- mosed, figs. 320-323; penes a pair of relatively
. Bulletin. Natural history; Natural history. 152 Illinois Natiral History Survey Bulletin \'oI. 26, Art. 1 KEY TO GENKKA Amir Fore tarsus not more than thrcc-tourths as long as fore .47. Anepeorus Fore tarsus longer than fore tibia 2 Vein R«+i of hind wing unbranched, fig. 321 48. Arthroplea \ein of hind wing forked at or near center of wing, tigs. 317-320 3 First segment of fore tarsus as long as or longer than second 43. Epeorus First segment of fore tarsus shorter than second ^ Stigmatic crossveins of fore wing anasto- mosed, figs. 320-323; penes a pair of relatively undifferentiated, elongate or stubby lobes, fig. 391 46. Rhithrogena Stigmatic crossveins of fore wing not anastomosed, or only partly so, as in fig. 319, or anastomosed and forming two rows of cellules, as in fig. 322; penis lobes variously modified, with lateral or apical expansions, figs. 331-356, 363- 380, 389 5 Penis lobes divided to base or fused on meson at base only, fig. 388 44. Cinygmula Penis lobes fused on meson for at least their basal halves, fiHs. 331-356, 363- 380, 389 T 6. Fi^. 317.—Stenonema canadensr, wings. Fi>5. 318.—Hcptat/enia maculipennis, wings. Fig. 319.—Epeorus pleuralis, wings. Fig. 320.—Rliithrogena morrisoni, wings. Fig. 321.—.^rt/iroplra up., wings. (After Blair.) Fig. 322.— integrum, stigmatic area of fore wing. Fig. 323.—Rhhhrngcna morrisoni, stigmatic area of fore 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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