III. Family Ceratopsyllidæ. Baker (1905).
Head on each side with two flaps situated at the front oral corner. Here belong the bat-fleas only. There are several genera, and about twenty-five species have been described. In most of the bat-fleas the maxillæ are shaped like a dumb-bell, but in the genus Thaumopsylla they are triangular as in the Pulicidæ.
Oudemans (1909) has put forward an alternative classification of the order Siphonaptera based on the morphology of the head:—I. Integricipita, II. Fracticipita.
[ab]
APPENDIX B
A LIST OF BRITISH FLEAS AND THEIR HOSTS
A list of the British Fleas (Siphonaptera) revised to March 1913:
| 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 |