Assignments are given for the 13 H12C14N and 4 H12C15N laser transitions that have not yet been identified. Although 10 different vibrational systems give rise to 27 laser transitions for H12C14N and H12C15N combined, all follow the same basic pattern involving a particular Coriolis interaction and a population inversion between stretching and bending vibrational manifolds. The laser transitions involve rotational states up toJ=48, which is higher than has been observed in room‐temperature spectra.