So I turned the car around and headed south. I arrived at the spot in the new southern extension of Quinta Mazatlan and found a group of birders waiting by a brush pile where the junco had been seen earlier in the morning. It took a while but eventually the junco popped up. It was the "Gray-headed" subspecies of the Dark-eyed Junco. These are pretty common in the southwestern US but I think it may be the first for the lower RGV. The few juncos we get are of the eastern "Slate-colored" subspecies. And it was my 400th species for Hidalgo County and fifth new county bird in the last ten days. I went the entire year of 2016 with out getting any new Hidalgo County birds, so this has been quite a streak.
I started the morning with six Buffleheads at the Sugar House Pond. That was a new one for the county year list.
It's always tough to find Dunlins inland. This one was at Delta Lake.
Two weeks ago I thought it might take a few years to get the county list up to 400. I guess I was wrong.