C. Strickland and N. H. Swellengrebel 
439 
Pulex irritans, Linnaeus. 
Xenopsylla cheopis, Rothschild. 
„ brasiliensis, Baker. 
Hoplopsyllus anomahis, Baker. 
Ctenocephalus canis, Dughs. 
„ felis, Bouche. 
Ceratophyllus fasciatus, Bose. 
„ londiniensis, Rothschild { = itaUcus, Tiraboschi). 
„ a7l^s^ls, Rothschild. 
„ penicilliger, Grube. 
„ niger, Fox. 
Pygiopsylla hilli, Rothschild 1 perhaps not found on M. rattus but on 
„ rainbowi, Rothschild J M. assimilis only. 
Chiastopsylla rossi, Waterst. 
JVeopsylla bidentatiformis, Wagner. 
CtenophthahniLs agyrtes, Heller. 
„ assimilis, Taschenberg. 
Gtenopsylla musculi, Kolenati. 
Hystrichopsylla tripectinata, Tiraboschi. 
Lice and Acarines occurring on M. decumanus and M. rattus. 
(Given by Tiraboschi 1903—4, p. 161, and by Shipley 1.909, p. 68.) 
Lice. 
Hoplopleura aeanthopus, Drury. 
Haematopinus spimdosus, Burmeister. 
Pediculus capitis, Nitzsch. 
Haematopinus precisus, Neumann. 
Ticks. 
Ixodes riemus, Linnaeus (larvae reported by Nuttall in England : noted by 
Neumann). 
Hyalomma aegyptium, Linnaeus (larvae from India reported by Nuttall). 
Rhipicephalus sanguineus, Latreille (adults identified by Nuttall; see Shipley). 
Demodicidae. 
Demodex musculi, Oudemans (other varieties have been found on rats (Hahn), 
and we find one species very common in Cambridge). 
Gamasidae. 
Laelaps agilis, Koch. 
„ echidninus, Berlese. 
stabularis, Koch. 
Myonyssus decumani, Tiraboschi. 
Notoedres alepis, Railliet-Lucat. 
