Continuing rising trends, country's foreign exchange reserves surged by $1.758 billion to mount a new record high of $ 411.124 billion in the week to January 5, the Reserve Bank said on Saturday. In the previous week, foreign exchange reserves had jumped by $4.444 billion to reach a fresh peak of $409.366 billion. The reserves had crossed the $400-billion mark for the first time in the week to September 8, 2017 but had since been fluctuating.