A. multidentatus (C. Fox, 1909)

Ceratophyllus multidentatus C. Fox, 1909: 107 . Atyphloceras multidentatus; Jordan & Rothschild, 1915: 59. Atyphloceras artius Jordan, 1933b: 69 .

Atyphloceras felix Jordan, 1933b: 69 .

Distribution. Canada and USA.

Hosts. Sorex trowbridgii and S. t. trowbridgii . Other hosts. Rodentia: Clethrionomys californicus, Lemmiscus curtatus, Microtus californicus, M. longicaudatus abditus, M. l. angusticeps, M. oregoni, M. townsendii, Neotoma sp., Peromyscus boylii, P. b. rowleyi, P.

californicus insignis, P. eremicus fraterculus, P. maniculatus artemisiae, P. m. gambeli, P. truei gilberti, and Rattus norvegicus (Hubbard, 1947; Hopkins & Rothschild, 1962; Ayala­ Barajas et al., 1988).