Nice Bluegrass lawn, but two patches of different grass (longer, lighter green)

With thanks to the posts here, the 2,000 sq. ft. front lawn is fine, except for two areas approximately one sq. ft. each. The Bluegrass in these two areas has been overgrown or replaced by grass which grows faster, has a broader leaf, and much lighter green. Vaguely recall that there's a grass which is temporary during winter and fall.



What to do about this ? Dig it up and reseed ?