We have grown single crystals of R₂MIn₈ compounds (R=La, Ce, Pr; M = Rh, Ir) and measured magnetic and transport properties of these crystals in the temperature range 1.8--300 K. We have found that Ce₂RhIn₈ is an antiferromagnet with a Neel temperature  T_N=2.8 K and Ce₂IrIn₈ is in a paramagnetic state down to 1.8 K. The Ce-based compounds are dense Kondo materials with the Kondo temperatures of several tens of Kelvins and nearly a hundred Kelvin for Ce₂RhIn₈ and Ce₂IrIn₈, respectively. The Pr ions in the Pr-based compounds are in the singlet ground states.

PACS numbers: 75.30.Kz