LGT OVERSHOT BACK COURSE THEN LEFT ASSIGNED ALT EARLY. FO FLYING WAS NEW TO THE AIRPLANE.

Narrative

THE FO WAS FLYING THE LEG TO RNO. WHEN WE WERE CLRED FOR APCH TO RWY 34L BACK COURSE ILS; WE HAD ABOUT A 30 DEG INTERCEPT HDG AND WERE PREVIOUSLY GIVEN A SPD OF 210 KTS. AS WE WERE CLRED FOR THE APCH I WAS CHANGING MY RADIO TO MATCH THE ILS BACK COURSE WHEN I NOTICED WE HAD FLOWN THROUGH THE LOC; AND TOLD THE FO TO TURN BACK TO INTERCEPT. HE WAS ON AUTOPLT AND WAS SLOW TO TURN; SO I TOOK THE PLANE AND BANKED ABOUT 30 DEGS TO REINTERCEPT AND GAVE IT BACK TO THE FO. APCH CALLED REFING OUR OVERSHOOT; AND WHILE I WAS TALKING TO APCH I NOTICED THE FO WAS DSNDING BELOW 8500 FT. APCH CALLED AGAIN REPEATING THE CLRNC TO MAINTAIN 9000 FT UNTIL ESTABLISHED ON THE LOC. ABOUT THE TIME I WAS RESPONDING WE WERE REINTERCEPTING THE LOC AND I TOLD APCH WE WERE ESTABLISHED AND CONTINUED APCH AND LNDG. I FOUND OUT ON THE GND THE FO WAS VERY NEW ON THIS PLANE AND HAD PUT THE INBOUND COURSE ON THE BACK COURSE WHICH CAUSED OVERSHOOT PROB. HE ALSO DID NOT START SLOWING SOON ENOUGH AS WE WERE CLRED FOR APCH. WE HAD A LONG DAY AND BOTH WERE VERY TIRED. I SHOULD HAVE XCHKED HIS RADIOS SOONER TO VERIFY THEY WERE CORRECT. ALSO; I SHOULD HAVE KEPT THE PLANE ONCE I FIRST TOOK OVER; WHICH WOULD HAVE KEPT US FROM LEAVING 9000 FT UNTIL RE-ESTABLISHED ON THE LOC. THE FO SHOULD HAVE TOLD ME HE WAS NEW ON THIS PLANE.