DHC8-200 ACFT TAXIING INTO RAMP AND UNDER MARSHALLER GUIDANCE HIT THE WING OF ANOTHER DHC8 ACFT PARKED INCORRECTLY. NO WING WALKERS AND MARSHALLER WAS CONCENTRATING ON NOSEWHEEL LINE UP INSTEAD OF ALSO OBSERVING WING CLRNC. DURING TAXI IN THE CAPT BECAME ILL AND THE FO TAXIED WHILE THE CAPT WAS INDISPOSED; BUT THE CAPT THEN AGAIN TOOK OVER TAXIING INTO THE RAMP.

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THE FLT WAS NORMAL AND UNEVENTFUL. AFTER LNDG WE TAXIED INTO THE RAMP ON CS -- AT OUR COMPANY CAPT USUALLY TAXIES BECAUSE STEERING TILLER IS ON THAT SIDE; ALTHOUGH TAXI CAN BE SUCCESSFULLY ACCOMPLISHED FROM THE R-HAND SIDE AS WELL THROUGH RUDDER PEDALS. WE WERE REQUIRED TO STOP BEHIND ANOTHER ACFT. AT THIS POINT THE CAPT PROPERLY AND CORRECTLY GAVE THE ACFT CTLS TO ME SO THAT HE COULD VOMIT IN A SICK SACK. IN OUR TURN; I CONTINUED OUR TAXI TOWARD THE GATE. AT APPROX THE BN LINE; THE CAPT SAID HE WAS WELL ENOUGH TO CONTINUE THE TAXI. I HANDED THE CTLS BACK TO HIM AND HE CONTINUED THE TAXI. AS WE PROCEEDED TOWARD THE GATE; WE WERE EXACTLY ALIGNED WITH THE MARSHALLER. THERE WERE NO WING WALKERS PRESENT -- COMPANY POLICY REQUIRES THEM ONLY WHEN ENOUGH PERSONNEL EXISTS. HOWEVER; THERE WERE 2 RAMPERS -- LATER CONFIRMED TO BE A TRAINER AND A NEW HIRE. AS WE SLOWLY PROCEEDED TOWARD THE GATE; THE MARSHALLER GAVE NO SIGNAL TO SLOW; STOP; OR TURN. FROM MY VANTAGE POINT; I DO NOT HAVE A CLR VIEW OF THE L WING AND THE CAPT WAS CONCENTRATING ON THE MARSHALLER'S DIRECTIONS. WHEN WE CAME TO A STANDSTILL; THE RAMPERS REALIZED WHAT HAPPENED: ABOUT 4 FT OF OUR WINGTIP CONTACTED THE WINGTIP OF THE ACFT NEXT TO US. WE ARE BOTH DASH 8'S; 200 SERIES. DAMAGE APPEARED TO BE MINIMAL TO OUR LEADING EDGE AND WINGTIP LIGHTS AND TO THE OTHER DASH'S AILERON. NO PERSONS WERE HURT IN THE INCIDENT. WHAT SEEMS TO HAVE HAPPENED IS THE OTHER DASH WAS INCORRECTLY PARKED ON A 'T' MEANT FOR A SMALLER BEECH 1900. HIS 'T' WAS LOCATED AT LEAST 6-8 FT L OF ITS NOSE. WE WERE STOPPED ON OUR 'T.' THE RAMPERS ASSUMED THEY WERE PARKED CORRECTLY AND 2 DASHES ALWAYS FIT NEXT TO EACH OTHER WHEN PARKED CORRECTLY. THEY DIDN'T TAKE THE CARE NECESSARY TO ASSURE WE DIDN'T TOUCH. THERE WAS NOTHING THE CAPT OR I COULD HAVE DONE TO PREVENT THIS INCIDENT FROM OCCURRING.