| Names | Usual Hosts |
| Pulex, L. |
| P. irritans | Man, Badger |
| Xenopsylla, Glink. |
| X. cheopis, Rothsch. | Rat |
| Archæopsylla, Dampf |
| A. erinacei, Bouché | Hedgehog |
| Ctenocephalus, Kolen |
| C. canis, Curt. | Dog |
| C. felis, Bouché | Cat |
| Spilopsyllus, Baker |
| S. cuniculi, Dale | Rabbit |
| Ornithopsylla, Rothsch. |
| O. lætitiæ, Rothsch. | Puffin and Manx shearwater (Scilly Is. only) |
| Ceratophyllus, Kolen |
| C. fasciatus, Bosc. | Rat |
| C. londiniensis, Rothsch. | House-mouse, Rat |
| C. sciurorum, Schrk. | Squirrel, Dormouse |
| C. melis, Wlk. | Badger |
| C. mustelæ, Wagner | Bank-vole and Field-mice |
| C. penicilliger, Grube | Bank-vole and Field-mice |
| C. walkeri, Rothsch. | Stoats, Voles, and Field-mice |
| C. gallinæ, Schrk. | Chickens and many birds |
| C. fringillæ, Wlk. | Sparrow |
| C. garei, Rothsch. | Many birds |
| C. rusticus, Wagner | House-martin |
| C. farreni, Rothsch. | House-martin |
| C. hirundinis, Curt. | House-martin |
| C. columbæ, Gerv. | Pigeon |
| C. styx, Rothsch. | Sand-martin |
| C. gallinulæ, Dale | Many birds: especially freshwater breeders |
| C. vagabundus, Bokeman | Nests of Sea-fowl |
| C. borealis, Rothsch. | Gannet and Rock-pipit |
| C. rothschildi, Waterst. | House-martin |
| Ctenophthalmus, Kolen |
| C. agyrtes, Heller | Field-mice and Voles |
| C. agyrtes nobilis, Rothsch. | Water-rat |
| C. bisoctodentatus, Kolen | Mole |
| Doratopsylla, Jord. and Rothsch. |
| D. dasycnemus, Rothsch. | Shrew |
| Rhadinopsylla, Jord. and Rothsch. |
| R. pentacanthus, Rothsch. | Weasel |
| R. isacanthus, Rothsch. | Bank-vole |
| Palæopsylla, Wagner |
| P. sorecis, Dale | Shrew |
| P. minor, Dale | Mole |
| P. kohauti, Dampf | Mole |
| Leptopsylla, Rothsch. |
| L. musculi, Duges | Mouse |
| L. spectabilis, Rothsch. | Bank-vole |
| Typhloceras, Wagner |
| T. poppei, Wagner | Long-tailed Field-mouse |
| Hystrichopsylla, Taschb. |
| H. talpæ, Curt. | Mole |
| Ischnopsylla, Westw. |
| I. elongatus, Curt. | Noctule Bat |
| I. intermedius, Rothsch. | Serotine Bat |
| I. simplex, Rothsch. | Natterer’s Bat |
| I. octactenus, Kolen | Pipistrelle Bat |
| I. hexactenus, Kolen | Long-eared Bat |
| Nycteridopsylla, Oudemans |
| N. longiceps, Rothsch. | Pipistrelle Bat |
| N. eusarca major, Rothsch. | Noctule Bat |