. Bulletin. Natural history; Natural history. September, 1943 Mohr: Furbearer Distribution and Income 515 center of relative scarcity lies in the south- eastern quarter of the state. About nine times as many minks were caught in Lake County as in Mason County, in 1938-39 and 1939-40, accord- Fig. 6.—Distribution of minks in Illinois as indicated by fur-takers' monthly reports for the seasons of 1929-30, 1930-31 and 1934-35 through 1939-40. Data for these eight seasons of monthly reports have been transferred to the map in such a way that the county having the largest average catch
. Bulletin. Natural history; Natural history. September, 1943 Mohr: Furbearer Distribution and Income 515 center of relative scarcity lies in the south- eastern quarter of the state. About nine times as many minks were caught in Lake County as in Mason County, in 1938-39 and 1939-40, accord- Fig. 6.—Distribution of minks in Illinois as indicated by fur-takers' monthly reports for the seasons of 1929-30, 1930-31 and 1934-35 through 1939-40. Data for these eight seasons of monthly reports have been transferred to the map in such a way that the county having the largest average catch per fur-taker has the greatest density of dots; other counties are dotted proportionally. The numbers in the margins represent for each county indicated the average catch per square mile as revealed by Brown's survey for the 1938-39 and 1939-40 seasons. In general, a close correlation exists between the two sets of data, despite the fact that one is for eight seasons and the other for two. ing to Brown's survey. It is probable that some of the counties in the southeastern quarter of the state had even fewer minks than did Mason County, fig. 6. Trappers, Catch and Income.—The index figures for percentage of fur-takers catching minks, table 3, vary from 65 and 62 during the 1936-37 and 1930-31 sea- sons, respectively, down to 43 in 1941-42, indicating a general population decline. The index figures are 5 and 6 points higher for the 1938-39 and 1939-40 sea- sons, respectively, than the percentages calculated on the basis of the oral survey data. Monthly report data show no change for the two seasons in the percentage of fur-takers catching minks, but oral report data indicate a rise in the second season. The catch-per-effective-trapper index figures show no definite general trend for the 10 years for which we have data; the highest figure is and the lowest , table 3. Index figures are and point lower for the 1938-39 and 1939-40 seasons, respectively, than the a
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