Rattus rattus alexandrinus (Geoffroy)
Mus alexandrinus Geoffroy, Catal. Mam. du Mus. Nat. d'Hist. Nat. Paris, p. 192, 1803.
R[attus]. rattus alexandrinus [Hinton], Jour. Bombay Nat. Hist. Soc., 26:63, December 20, 1918.
Type.—From Alexandria, Egypt.
Remarks.—This subspecies seems to be rare in Washington. My specimens are all from small, isolated islands in the San Juan group. All were taken in the vicinity of human habitations. R. r. alexandrinus resembles R. r. rattus, differing only in brown color of upper parts.
Rattus norvegicus norvegicus (Erxleben)
Norway rat
[Mus] norvegicus Erxleben, Syst. Regni Anim., 1:381, 1777.
Rattus norvegicus Hollister, Proc. Biol. Soc. Washington, 29:126, June 6, 1916.
Type.—From Norway.