This was Fragile Forktail day at Cypress Springs lake. They were out in the thousands in the grasses near the lake. I saw them in every color combination possible. However, this is the first time I've seen a brown one. I think Fragile Forktail is the only possibility. I didn't realize they could appear brown when immature. The only other option might be Eastern Forktail, but they don't occur here. I've looked for them and I don't think there are any recorded near here. There are a few sightings of Eastern Forktail up near Denton Tx, but that is far away and different eco band.