We report HST /ACS observations of two nearby gas-rich dwarf galaxies : DDO 161 and UGCA 319 .
Their distances determined via the Tip of the Red Giant Branch are 6.03 _ { -0.21 } ^ { +0.29 } Mpc and 5.75 \pm 0.18 Mpc , respectively .
The galaxies form an isolated pair dynamically well separated from the nearest neighbors : KK 176 ( 7.28 \pm 0.29 Mpc ) and NGC 5068 ( 5.16 \pm 0.21 Mpc ) .
All four galaxies have a bulk spatial peculiar velocity towards the Virgo cluster of \sim 158 \pm 17 km s ^ { -1 } in the Local Group rest frame and \sim 330 km s ^ { -1 } with respect to the cluster center .