  We report measurements of trigonometric parallax and proper motion for two
6.7 GHz methanol and two 22 GHz water masers located in the far portion of the
Sagittarius spiral arm as part of the BeSSeL Survey. Distances for these
sources are estimated from parallax measurements combined with 3-dimensional
kinematic distances. The distances of G033.64$-$00.22, G035.57$-$00.03,
G041.15$-$00.20, and G043.89$-$00.78 are $9.9\pm0.5$, $10.2\pm0.6$,
$7.6\pm0.5$, and $7.5\pm0.3$ kpc, respectively. Based on these measurements, we
suggest that the Sagittarius arm segment beyond about 8 kpc from the Sun in the
first Galactic quadrant should be adjusted radially outward relative to
previous models. This supports the suggestion of Xu et al. (2023) that the
Sagittarius and Perseus spiral arms might merge in the first quadrant before
spiraling inward to the far end of the Galactic bar.
