OF NORTHUMr.KRI-AND AND DURHAM 195 



Ceratophylius walkeri Roths. (1902). 



From nests of various small rodents in the Derwent 

 Valley (Winlaton, Gibside, HoUinside and Rlanchland) ; 

 Stocksfield and Hart. On two occasions from specimens of 

 ^he field vole [Evofotnys agrestis), Fatfield (W. Hall). 



" A common species in England and Scotland, not 

 recorded from Ireland. Chief hosts are the stoat, the weasel, 

 and the bank vole {^Evotomys glareolus). C. walkeri \\?^?, not 

 been recorded from the Continent." 



Ceratophylius mustelae Dale (1878). 



Two examples from the field vole {Evofomys agrestis), 

 Fatfield (W. Hall). 



" Common in England and Scotland, not recorded from 

 Ireland. Occurs on many hosts- amongst which may be 

 cited long-tailed field mouse, bank vole and the stoat." 



Ceratophylius melis Walk. {1856). 



Two or three friends have reported having seen a largish 

 flea upon badgers in the Derwent Valley (Spen Banks and 

 Ebchester), in one case swarming. I think this can only be 

 C. melis, but have not seen actual specimens. 



There are specimens in Mr. Rothschild's collection from 

 Middlesbrough, 6. viii. 1903. 



" A rare species, recorded from England and Ireland. The 

 host is the badger {Meles uieles)" 



Genus CTENOPHTHALMUS Kolen. 



Ctenophthalmus agyrtes Heller (1896). 



Common in moles' nests at Bradbury, county Durham, 

 near Hartlepool and on the western borders of Northumberland. 

 One example in a rodent's nest, Harperley in Weardale. 

 Common on rats, once in nest of shrew (? water shrew Crossopiis 

 fodiens Wagl.), once on a house mouse and several on a field 

 vole, Fatfield (W. Hall). Numerous examples in a rat's nest, 

 Gibside. 



