102 J. B. CLELAND. 
submitted on February 11th, 1911, were a number of small, 
round, firm, yellowish-white nodules the size of wheat grains 
or larger. 
The KEcto-Parasites of Rats and Mice. 
The ecto-parasites of these rodents met with in Aus. 
tralia comprise fleas, bed-bugs, lice and species of acarina. 
FLEAS: Ham! gives a list of fleas associated with rats and 
mice. ‘Twenty-eight specific names are given of fleas found 
associated with individuals of the genus Mus, sensw lato. 
As probably three of these at least are synonyms, the total 
number of fieas recorded from Epimys rattus, E. norvegi- 
cus and Mus musculus is reduced to eleven, two of which 
are fowl fleas occasionally occurring on rats and mice. He 
gives the following as the flea species met with in associa- 
tion with E. rattus and HE. norvegicus :— 
1. Pulex irritans Linn. 
2. Pulex cheopis Rothschild. 
3. Ctenocephalus cams Curtis (=C. felis Rothsch., and C. 
serraticeps). 
. Ceratophyllus fasciatus Bose. 
. Ceratephyllus londomensis Rothsch. 
. Ceratophyllus italicus Tiraboschi. 
. Neopsylla bidentatiformis Wagner. 
. Ctenopsyllus muscult Duges. 
. Clenopsyllus taschenbergi Wagner. 
Of the above list, Nos. 1, 2, 3, 4, and 8 have been found on 
rats or mice in Australia. 
aD OP 
c oO 
In the routine examination of rats for plague as carried 
out by the Microbiological Laboratory at the Department of 
Public Health, Sydney, the number of fleas collected weekly 
from the rats have been tabulated from the beginning of 
1909 to 1917. During this period the total number of 
fleas identified comprises the following :—Lemopsylla 
2 Report on Plague in Queensland, 1900-1907, p. 144. 
