I saw this sparrow in Montell, Uvalde County, Texas. Hill Country with nearby river frontage on the Nueces River. Date was September 16, 2018 at about 1:30PM. I only saw it the one time and it was silent. Mostly pale beige with streaks of darker brown and tan on back, sides and breast. Pink legs. Larger than nearby field sparrow but smaller, I think, than a lark sparrow. It has been suggested that this is a Cassin's, but I'm not sure. I'm including some images that I hope will help.