| abstract | The following ectoparasites were obtained from 52 specimens of the Collared Lemming (Dicrostonyx torquatus) on Bathurst Island, N.W.T., Canada. Anoplura: Hoplopleura acanthopus (Burmeister) (on 21 hosts); Acarina: Laelaps alaskensis Grant (27 hosts), Hirstionyssus isabellinus (Oudemans) (15 hosts), Haemogamasus ambulans (Thorell) (13 hosts), Radfordia macdonaldi, n. sp. (4 hosts), and Myocoptes japonensis canadensis Radford (3 hosts). In addition, about 20 hypopi of the scavenger mite Dermacarus hypudaei (Koch) were found on 1 host. The new myobiid, Radfordia macdonaldi, is described and illustrated. |