Two waveguide CO2 lasers, a quartz waveguide and an alumina waveguide, have been studied on the 00 degrees 2-[10 degrees 1,02 degrees 1](I,) (II) sequence bands. The use of an intracavity hot CO2 cell, which is a part of the waveguide, suppresses the regular-band transitions. The quartz waveguide laser has a total of 58 lines lasing on both the 9.4 mu m and 10.4 mu m sequence bands. The alumina waveguide laser has 36 lines lasing on the 10.4 mu m sequence band and twice the output power of the quartz waveguide laser, whereas lasing on the 9.4 mu m sequence band is difficult. The lasers can be operated on the selected single line without line jumping problem. The frequency tuning range of the strong lines is limited by the free spectral range of the cavity.