Mark Anderson signed a four-year deal with the Bills on Wednesday. (AP)

Catching up on a couple of Patriots personnel moves from Wednesday:

•The Patriots have lost defensive end Mark Anderson to the Bills, who signed the 28-year-old to a four-year deal and figure to use him as a pure pass-rusher. Anderson was able to parlay a big season with New England into a four-year deal with Buffalo worth $27.5 million, including $8 million guaranteed, according to ESPN’s Adam Schefter. Anderson, who was signed to a one-year deal before the start of the 2011 season, finished the year with 10 sacks (plus 2.5 more in the postseason), two forced fumbles and 14 quarterback hits. (Overall, Pro Football Focus had Anderson as the Patriots’ best pass rusher, grading him at +13.2. Andre Carter was second at 5.1.)

The Patriots seemingly started preparing for life without Anderson last week with the acquisition of Trevor Scott from the Raiders. Now, Scott figures to have more of an important role with New England going forward. It also appears likely the Patriots will lean on a return of fellow defensive end Andre Carter, who has expressed an interest in returning to the Patriots, even after he suffered a season-ending calf injury in a December win over the Broncos. New England also has Rob Ninkovich and Jermaine Cunningham as defensive end/outside linebacker types, as well as Markell Carter, who spent the 2011 season on the practice squad.

•According to Mac’s Football Blog, the Patriots have agreed to terms on a one-year contract with cornerback Will Allen. The 33-year-old, who was a first-round pick of the Giants out of Syracuse in 2001, has 527 tackles, five sacks, 15 interceptions and 109 passes defensed during his 11-year career. Allen, who suffered a torn ACL in his left knee that sidelined him for much of the 2009 and the entire 2010 season, had his best year in 2008 when he started 16 games for Miami and finished with 50 tackles (42 solo) and three interceptions for the Dolphins.

Despite his age — he’ll be 34 by the time the 2012 season begins — Allen had very good numbers as a slot corner last season with Miami. According to Pro Football Focus, he was in the slot for 419 snaps last season (tops in the league) and he yielded 0.81 yards per coverage snap for 3rd best in the league.In addition, he allowed a catch once every 11.6 coverage snaps, a rate that was sixth best in the league.