Black and tan terriers are the group including the Manchester, Lakeland, and Welsh terriers. The Patterdale generally has a lot of black. Black and tans are an old breed, used as ratters and in hunting rabbits- http://www.thebreedsofdogs.com/Manchester_Terrier.htm
Manchester

On the small side of the breed (7 vs. 12-14 lbs.) we have a terrier which is registered with the AKC as a Toy Fox Terrier, different from the English Toy terrier ('Black & Tan') in that it has white as well as the dark colors. Other breeds have been added to the stock.

Fell terrier is another old name for the group.