Mo. Rev. Stat. § 54.160
The county treasurer in each county is the custodian of all moneys for school purposes, belonging to the different districts, until paid out on warrants duly issued by order of the board of directors or to the treasurer of some town, city or consolidated school district, as authorized by law, except in counties having adopted the township organization law, in which counties the township trustee is the custodian of all school moneys belonging to the township, and is subject to corresponding duties as the county treasurer. On such official's election, before entering upon the duties of the official's office, the official shall give a surety bond, with sufficient security, for the school moneys that shall come into the official's hands, payable to the state of Missouri, to be approved by the county commission, and paid for by the county commission out of the county common school funds, conditioned for the faithful disbursement, according to law, of all the moneys that from time to time come into the official's hands except that no county treasurer shall be required to give bond in excess of one-fourth of the amount collected during the same month of the year immediately preceding. On the forfeiture of the bond the county clerk shall collect the same for the use of the schools in the various districts. If the county clerk neglects or refuses to prosecute, then any resident of the county may cause prosecution to be instituted. The county treasurer in any county of the third or fourth classification may furnish either a personal or surety bond.
§ 54.160, RSMo