Ratings Chart Attack!

“Gossip Girl” ended its season on a high note in the ratings Monday, while “American Gladiators” slid again from last week’s disappointing season premiere.

“Gladiators” dipped 16% to a 1.6 rating/4 share in the 18-49 demographic, according to preliminary Nielsen numbers. Last week’s “Gladiators” fell 68% from its premiere in January. Followed by “Dateline” (2.0/5), NBC finished fourth with a 1.8/5.

The CW (1.5/4) brought its freshman standout “Gossip Girl” to a close with a 1.4/4 in 18-49; it earned a 1.8/6 among the network’s target 18-34 demographic. “Girl’s” 18-49 numbers haven’t been that good since the show’s premiere in September.

“One Tree Hill” (1.5/4) improved 25% for its season finale. Both shows boosted The CW to the best Monday in 18- to 49-year-olds in the network’s history.

At the front end of the night, “Bones” (3.3/10) ended flat for Fox (4.5/12), while the second part of the “House” (5.7/14) finale dipped slightly from last week.

CBS (4.0/11) cleaned up with a night of finales. “Rules of Engagement” (4.3/10) and “CSI: Miami” (4.4/12) both were up slightly from last week, while the rest of the night was down. “Two and a Half Men” (4.8/12) slid 6%, “The Big Bang Theory” (2.7/8) dropped 7% and “How I Met Your Mother” (3.2/9) stumbled 16% off its guest appearance from Britney Spears last week.

ABC (3.4/9) premiered its latest iteration of “The Bachelorette” (3.0/8) with jilted “Bachelor” contestant Deanna Pappas. The show dropped 30% from the program’s last season premiere back in January 2005.

“Dancing With the Stars” (4.3/12) wound down with its last performance show, up a tick from last week.