C. Strickland and G. Merriman 
15 
Ceratophyllus hirundinis (Curtis, 1832) Rothschild, 1900. 
This species is represented in our collection by a headless specimen. 
It has only been found previously on sand-martins and swallows 
{H. urhica and H. rustica). 
Palaeopsylla sorecis (CtenopJithalnms sorecis Dale, 1878) 
Dampf, 1910. 
This species was taken once from a rat in the parish of Swelling. 
Palaeopsylla minor {Ceratophyllus minor), Dampf, 1910. 
We have captured this flea once on Mus decurnanus and once on the 
stoat. It has previously been taken from Mustela putorius. 
Species of fleas found on other hosts than rats^. 
The species of fleas referred to in the foregoing pages have been 
found by us to occur on the following hosts other than rats; 
Man ... Pulex irritans, C. gallinae, C. agyrtes, G. faacioUtst. 
Stoat ... P. minor, C. agyrtes, C. fasciatm. 
Mouse ... C. musculi, C. fasciatm. 
Dog ... C. eanis, G. gallinae. 
Ferret ... G.fasciatus, G. agyrtes. 
Rabbit ... G. fasciatus, G. agyrtes, Spilopsyllus euriicMli". 
Hedgeliog ... C. erinacei. 
From the point of view of their numbers only, C. fasciatus and 
G. agyrtes appear to be the only two species which could have any 
practical significance in the epidemiology of plague, yet the other 
species which we found might become important another year or under 
other conditions. A species rare one year may become dominant 
another. For instance, Tiraboschi, Verjbitski, Gautier and Raybaud, 
and Tidswell have all reported on the great prevalence of Ctenopsylla 
musculi, but we only collected three specimens of this species. 
1 Fleas were also found in the following situations away from any host: 
Barn ... C. gallinae. 
Hole of tree ... G. gallinae. 
Rats’nests ... G. fasciatus, C. agyrtes. 
^ Spilopsyllus cuniculi (Pulex cuniculi Dale 1878). This species has been previously 
found on the rabbit, cat, and rat. We obtained one specimen from a rabbit but none from 
the rat. Martin and Rowland state that it bites man. 
