I think this is your man.
Texas 2nd Cavalry Battalion, State Troops
First Commander, Major J. C. Carter
Northern Sub-district, Destrict of Texas, New Mexico, and Arizona, Trans-Mississippi Department ( November 1863 ). Townes' Cavalry Brigade, Slaughter's Division (or Eastern Sub-district ),District of Texas, New Mexico, and Arizona, Trans-Mississippi Department (December 1863-January 1864 ).
Organized with three companies for six months in late 1863.
Increased to a regiment and designated as the 2nd Cavalry Regiment, State Troops in late 1863.
I hope this helps,
Gary D. Bray