Abstract
Dermacentor vriabilis (Say) larvae and nymphs were collected from P. leucopus and from cotton nests formed by them in nestboxes at Clyde, Wisconsin. D. variabilis larvae were seasonally distributed in 2 peaks occurring on both north- and south-facing hill slopes in late April and early June. Numbers increased with increased mouse nesting, and significant relationships were detected among nesting classes. No differences were found between tick means and the 2 slopes studied. Berlese funnels were found to be inefficient in expelling engorged D. variabilis from nest material.
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