. Bulletin. Natural history; Natural history. 398 Illinois Natural History Survey Bulletin Vol. 33, Art. 4. Fig. 129.—Total distribution of Orconectes kentuckiensis. (Boyd & Page 1978). No record of its occurrence in Illinois predates those of Brown (1955). O. kentuckiensis prob- ably was never more widespread in Il- linois than it is today. O. kentuckiensis is most common in shallow, rocky pools of small streams (Boyd & Page 1978), where large rocks are used as cover, although Rhoades (1944a) collected specimens in accumu- Fig. 130.—Distribution of Orconectes ken- tuckiensis in Illino
. Bulletin. Natural history; Natural history. 398 Illinois Natural History Survey Bulletin Vol. 33, Art. 4. Fig. 129.—Total distribution of Orconectes kentuckiensis. (Boyd & Page 1978). No record of its occurrence in Illinois predates those of Brown (1955). O. kentuckiensis prob- ably was never more widespread in Il- linois than it is today. O. kentuckiensis is most common in shallow, rocky pools of small streams (Boyd & Page 1978), where large rocks are used as cover, although Rhoades (1944a) collected specimens in accumu- Fig. 130.—Distribution of Orconectes ken- tuckiensis in Illinois; black dots = 1972-1982 collections. lations of brush over mud. This species does not burrow but may bury itself in loose gravel 2-4 cm below the surface of a dry stream bed (Boyd k Page 1978). Life History.—The life history of O. i { Table 14.—Frequency of occurrence of form I males, females carrying eggs (ovigerous), and females carrying young, in Illinois collections of Orconectes kentuckiensis. Number and Percem o( Collet lions with Number of Month Colleciions Form I M ales 0\igerous Females Females with Young Janiiaiy 5 4 80 0 0 0 0 Keljiuary 1 1 100 0 0 0 0 March 10 7 70 3 33 0 0 April 5 2 40 3 60 0 0 May 9 0 0 1 11 0 0 June 16 0 0 0 0 0 0 July 5 2 10 0 0 1 -'0 August 4 1 25 0 0 0 0 Sepleniber 9 7 78 0 0 0 0 Otlobcr II 6 55 0 0 0 0 Novcmbir •! 1 100 0 0 0 0 December 3 3 100 0 0 0 0. 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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