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Some guides, such as the National Geographic guide, do not use color shading to indicate where a bird might be found in migration. (The National Geographic guide shows permanent range, breeding range, and winter range only). Sometimes, the National Geographic guide will use arrows to show migration paths or dashed lines to indicate the border of the migration range, but in certain cases, as in the case of Black Tern, it gives no indication at all.
However, the Sibley guides, for one, do use color shading to indicate presence during migration. I think this is definitely preferable.
Black terns are now here on the Texas coast, and I have a photo to prove it. I took this last weekend. As you can see there is quite a bit of color variation.
Black Terns are in Texas (See Kelly Bryan et al "A Checklist of Texas Birds" 7th edition and Shackelford and Lockwood "Birds of Texas Occurence and Seasonal Movements" (both booklets are Texas Parks and Wildlife Publications and can be found at www.tpwd.state.tx.us)). Interestingly, Arvin (Birds of the South Texas Brushlands) shows them as common late April to early June and late August to early November. He shows them as uncommon early June to late August and not occurring November to April. I could not find a cheklist for the Upper Texas Coast (south east Texas) so can not point to occurrence data there, but the seasonal movements book shows them as migrant only.