Volume s1-22, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


In the course of a study on the origin, distribution and ecology of commensal rats a few facts have become apparent which, I believe, are important enough to be published even before the general account is completed.

1. COMMENSAL RATS OF NORTH AMERICA All the American literature dealing with rats, systematic, ecological, medical, considers three types of these animals: viz. the Norway rat ( Berkenhout), the Black rat ( Linnaeus), and the Roof rat ( Geoffroy). This classification, apparently taken from Miller (1924), does not quite cover the facts. The true Geoffroy is not the animal usually referred to under this name. It has a brown back and grey belly, the two colors gradually passing into one another without any line of demarcation. The other animal, usually referred to as , has a brown back also, but the underside white or lemon yellow and sharply set off from the back.


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  • Received : 11 May 1942
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