Paramagnetic-resonance measurements have been made for the 3d5 configuration of Cr+ in ZnSe and ZnTe. The g factor, the cubic crystalline field parameter a, the hyperfine interaction with Cr53, A (Cr53), and the hyperfine interaction AZn with Zn67 nuclei occupying any of the twelve equivalent cation sites nearest the chromium have been determined. These resonance parameters are compared with those previously measured for Cr+ in cubic ZnS and CdTe and the variations from crystal to crystal are found to be consistent with changes in the covalency of the bonds and with lattice distortions caused by incorporating Cr+ substitutionally for the much smaller divalent zinc. The hyperfine interaction with Zn67 (or Cd111 and Cd113) at second-neighbor sites is, unlike the interaction of the isoelectronic Mn++ with these sites, found to vary from crystal to crystal in a manner consistent with changes in the covalent bonding. © 1964 The American Physical Society.