. Bulletin. Natural history; Natural history. 352 Illinois Natural History Survey Bulletin Art. 4 17. Dorsal surface of gonopod without prominent shoulder (Fig. 43) Orconectes placidus (p. 404) 18. Areola distinctly narrows just anterior to mid- length (Fig. 44); gonopod reaches coxa of cheli- ped with abdomen flexed; no black band on fingers of chela Orconectes virilis (y). AM) ^b^^j^ ! Fig 43. 18. Areola remains fairly wide throughout (Fig. 40); Fig. 44. gonopod does not reach coxa of first pair of walking legs; black band (fades in preservative) near tips of fingers of chela 19 19.
. Bulletin. Natural history; Natural history. 352 Illinois Natural History Survey Bulletin Art. 4 17. Dorsal surface of gonopod without prominent shoulder (Fig. 43) Orconectes placidus (p. 404) 18. Areola distinctly narrows just anterior to mid- length (Fig. 44); gonopod reaches coxa of cheli- ped with abdomen flexed; no black band on fingers of chela Orconectes virilis (y). AM) ^b^^j^ ! Fig 43. 18. Areola remains fairly wide throughout (Fig. 40); Fig. 44. gonopod does not reach coxa of first pair of walking legs; black band (fades in preservative) near tips of fingers of chela 19 19. Rostrum deeply excavated medially, with mar- gins distinctly converging anteriorly (Fig. 45) Orconectes illinoiensis (p. 386) 19. Rostrum shallowly excavated, margins barely p| ^^ converging anteriorly 20 20. Rostrum without median carina (Fig. 46);. Orconectes kentuckiensis (p. 396). 20. Rostrum with median carina (small in O. in- dianensis) (Fig. 47); 21 21. Mesial process of gonopod with spur on caudal surface (Fig. 48) Orconectes stnnnardi (p. 415) 21. Mesial process of gonopod without spur 22 22. Rostrum with large median carina (Fig. 49); gonopod with tips of elements barely di\erging Fig. 49. (Fig. 50); Orconectes propinquus (p. 406) Fig 48. / Fig. 47. Fig. 50. / 22. Rosinun with small meilian carina (Fig. 51); p| ^^ gonopod with tips of elements stroiigh di\erg- ing (Fig. 52).... Orcuneclrs indiiinensis (p. 394) Fig. 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
