A DCH8 LANDS AT MDT; PA; WITHOUT CLRNC TO LAND. FLC ATTN IS DIVERTED DURING THE VISUAL APCH DUE TO THE HIGH WORKLOAD OF THE FLC DURING DSCNT AND FATIGUE FACTOR.

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WE WERE AT 4000 FT MSL WHEN APCH ASKED US IF WE HAD AN ACR B737 IN SIGHT. WE CALLED IT IN SIGHT. HARRISBURG THEN CLRED US FOR A VISUAL APCH; BUT FAILED TO TURN US OVER TO MDT TWR. DUE TO THE ALT AND THE CLOSENESS TO THE ARPT; WE HAD A HIGH WORKLOAD TO GET THE ACFT CONFIGURED AND IN A POS TO LAND. AFTER LNDG AND TAXIING CLR OF THE RWY; WE NOTICED WE HAD NEVER BEEN TURNED OVER TO TWR. WE THEN SWITCHED TO TWR FREQ AND ASKED IF WE SHOULD TAXI TO THE RAMP WITH HIM. TWR TOLD US TO CONTACT GND. WE DID AND WERE CLRED TO THE RAMP. BOTH THE CAPT AND FO HAD WORKED 10 1/2 HRS THE DAY BEFORE AND WERE ON REDUCED REST. WE HAD BEEN WORKING SINCE XA15 AND WERE ON OUR LAST LEG OF THE TRIP. DUE TO THE REDUCED REST; BOTH CAPT AND FO WERE FATIGUED AND THIS MAY HAVE CONTRIBUTED TO US FAILING TO REALIZE WE WERE NOT TURNED OVER TO TWR AND NOT CLRED TO LAND. MDT ARPT ALSO HAS RWY CONSTRUCTION WITH ABOUT A 3000 FT DISPLACED THRESHOLD; WHICH ADDED ANOTHER THING TO CONSIDER DURING AN ALREADY HIGH WORKLOAD TIME. NO OTHER ACFT OR CONFLICT HAPPENED AND NO PROBS HAPPENED DUE TO THIS ERROR. SUPPLEMENTAL INFO FROM ACN 371670: THE CAPT TAXIED THE ACFT OFF THE RWY ONTO A TXWY WHEN I REALIZED THAT I WAS STILL ON APCH FREQ -- JUST AFTER I HAD ASKED; 'STAY WITH YOU TO THE GATE?' THE APCH CTLR REPLIED; 'CONTACT GND ON 121.70.' NOTHING ELSE WAS SAID TO THE APCH CTLR AND I CONTACTED GND ON 121.70. SOME CONTRIBUTING FACTORS ARE THE FOLLOWING: FATIGUE -- 1) REDUCED REST OVERNIGHT. 2) EXTREMELY WARM TEMP IN THE COCKPIT. APCH CTLR FORGETTING TO HAND US OVER TO THE TWR.