Arabica coffee contracts on ICE Futures US fell with other commodity markets that were hit by a rising dollar, but cocoa prices remained firm on Monday as supply concerns inspired some players to jump in after Friday's lower close, traders said.Arabica coffee for December delivery was down 0.30 cent at $1.4390 per lb by 9:41 am EDT (1391 GMT). The session range ran from $1.3910 to $1.3950. Benchmark December rose $50 to $2,862 a tonne by 9:48 am. Range spanned $2,825 to $2,870.