The Collaborative International Dictionary of English v.0.48:

Kamtschadales \Kam"tscha*dales\, n. pl. [from the older spelling
   Kamtschatka for Kamchatka.] (Ethnol.)
   An aboriginal tribe inhabiting the southern part of the
   Kamchatka peninsula; called also Kamchadals and Itelmen.
   [1913 Webster +PJC]