ROCKLAND, Maine — A 29-year-old Rockland man was sentenced to serve 30 months in prison after admitting to a series of crimes involving stolen and forged checks.

Casey D. Collins was sentenced Monday in Knox County Superior Court by Justice Jeffrey Hjelm to 30 months for two counts of felony theft, two counts of forgery and bail violations.

Collins was on probation for an earlier theft conviction when he was arrested in December for the new offenses. He had two prior theft convictions — in 2007 and 2011. He also had burglary convictions in 2003 and received an 18-month sentence as a result of those.

In the latest offenses, Collins sold clams to Kip’s Seafood in Cushing and was given a check for $32. Collins altered the check, however, and cashed it for $932, according to Assistant District Attorney Jeff Baroody.

Collins then stole a check from someone’s truck and cashed a check to himself for $3,200.

Both victims learned of the theft when they looked at their bank statements, the prosecutor said.