The triatomic hydrogen ion (H-3(+)) has spurred tremendous interest in astrophysics in recent decades, and Rydberg states of H-3 have also maintained an important role for understanding H-3(+) experiments In a previous study (J. Chem. Phys. 2010, 133, 234302), radiative transitions between neutral H-3 Rydberg states were calculated at wavelengths near 7 mu m and could be compared with mid infrared laser lines observed in hydrogen/rare gas discharges The present study extends the investigation to wavelengths near 10-13 mu m. Rydberg states of D-3 are also treated.