Abstract1In a mixed small mammal communityL.testaceuswas found to infestA.sylvaticusmore frequently than eitherC.glareolusorM.agrestis.2Male and female rodents carried similar numbers of the beetle.3Peak infestation onA.sylvaticusoccurred during spring and summer suggesting a single major emergence period.4There was good correlation between the beetle index and the numbers of individuals ofA.sylvaticusinfested; this relationship resembled that found within certain host/ectoparasite relationships.