Exhibit 23.4 CONSENT OF KEEFE, BRUYETTE & WOODS, INC. We consent to the inclusion in the Prospectus/Proxy Statement of MNB Bancshares, Inc. and Landmark Bancshares, Inc., as amended by Amendment No. 1 to the Registration Statement on Form S-4, of the use of the form of our opinion dated April 19, 2001, and to the summarization of our opinion in the Prospectus/Proxy Statement under the caption "Opinion of LBI's Financial Advisor." Further, we consent to all references to our firm in such Prospectus/Proxy Statement. /s/ Keefe, Bruyette & Woods, Inc. Keefe, Bruyette & Woods, Inc. Dublin, Ohio July 23, 2001