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Six hundred and twenty-eight insectivorous bats originating from seven provinces were submitted to this Institute for rabies diagnosis between August 1, 1963 and December 31, 1967. Brain tissue was examined by the fluorescent antibody technique and the mouse infectivity test was carried out with brain, salivary gland, interscapular adipose tissue and kidney samples. Rabies virus was detected in 44 bats, 29 of which were from Ontario, 12 from British Columbia and three from Manitoba. Most of the positive cases were diagnosed in summer months. Seven species were represented among the specimens found to be rabid; there were 32 big brown bats, three hoary bats, three silver-haired bats, two little brown bats, one eastern pipistrelle, one Keen myotis and one red bat. Another bat which was not identified also proved to be infected with rabies.