The Collaborative International Dictionary of English v.0.48:

Itelmen \Itelmen\, prop. n.
   1. (Ethnol.) An aboriginal tribe inhabiting the southern part
      of the Kamchatka peninsula; called also Kamchadal and
      Kamtschadal.
      [1913 Webster +PJC]

   2. The language of the Itelmen people.
      [PJC]

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]