Abstract
A 12-month investigation of Citellus leucurus leucurus in a small area located in Tooele County, Utah, substantiated the seasonal fluctuations in occurrence of flea spp. in that host. A reversal in the relationship between indices of Thrassis bacchi gladiolis and Hoplopsyllus anomalus to atmospheric temperature and relative humidity was indicated. Average temperature of 64[degree] F and average relative atmospheric humidity of 40% represent approximate critical points at which changes in spp. indices begin to reverse for the 2 spp. considered. A 3d spp., Rhadinopsylla heiseri was recovered in Nov. and Dec. only. Further data are presented regarding sex ratio of fleas and ratio of infestation of male and female squirrels.

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