C. Strickland and G. Merriman 
13 
Ceratophyllus walkeri Rothschild, 1902. 
This species was taken on only eight occasions from as many rats in 
the parishes of Bentley, Rushraere (3), Tattingstone, Brantham, Lawford, 
and Felixstowe. On one of the rats it was fonnd in company with 
G. mustelae, both species of flea probably having been picked up from 
the trail of a weasel. 
C. walkeri has also been found on the following hosts :— Mus musculi, 
Mustela vulgaris, M. erminea, Sorex vulgaris, Microtus glareolus, M. 
amphibius, Arvicola sp. M. vulgaris is, however, considered its true 
host. 
Archaeopsylla erinacei {Pulex erinacei Bouche, 1835). 
We found A. erinacei on two rats, once singly and once six of them, 
in the parish of Martlesham and the borough of Ipswich. This is the 
common hedgehog flea. Satunin found it once on Mus alexandrinus. 
Ctenopsylla musculi {Pulex musculi Duges, 1832). 
This, the common mouse flea, was only found three times on rats in 
East Suffolk. Three specimens were collected : two in Culpho and one 
in Parham. We found it once on mice in Framlingham and it has also 
been taken from Mus silvaticus and Mus rattus. 
Accoi’ding to Tiraboschi it does not bite man. 
Ctenophthalmus pentacanthus {Typhlopsylla pentacanthvs 
Rothschild, 1898) Wagner, 1902. 
The true host of this flea is stated to be the field vole, Microtus 
agrestis. It occurs also on Mus silvaticus, Talpa europaea, and Mtistela 
vulgaris. We have found it on three occasions on Mas decwmanus, 
each time singly, in Tuddenham, Walton, and Boxford. 
Pulex irritans {Pulex vidgaris Linnaeus, 1746) Rothschild, 1908. 
The natural host of this flea is man. We have found it twice on 
rats (two specimens) in Rushmere and Playford. Its other hosts are 
numerous, but according to Rothschild the badger is a time host. A 
doubt has been expressed with regard to this species serving as a plague 
vector from man to man, on the ground that the degree of septicaemia 
occurring in human plague is insufficient to infect the flea. 
