August 31, 2005

DREYFUS INVESTMENT PORTFOLIOS
Supplement to Statement of Additional Information
dated May 1, 2005

The following information supersedes and replaces the information contained in the section of the Statement of Additional Information entitled “Real Estate Investment Trusts”:

Real Estate Investment Trusts. (Core Bond, Core Value, Emerging Leaders, Founders Discovery, Founders Growth, Founders International Equity, MidCap Stock and Small Cap Stock Index Portfolios only) Each of these Portfolios may invest in REITs. A REIT is a corporation, or a business trust that would otherwise be taxed as a corporation, which meets the definitional requirements of the Internal Revenue Code of 1986, as amended (the "Code"). The Code permits a qualifying REIT to deduct dividends paid, thereby effectively eliminating corporate level Federal income tax and making the REIT a pass-through vehicle for Federal income tax purposes. To meet the definitional requirements of the Code, a REIT must, among other things, invest substantially all of its assets in interests in real estate (including mortgages and other REITs) or cash and government securities, derive most of its income from rents from real property or interest on loans secured by mortgages on real property, and distribute to shareholders annually a substantial portion of its otherwise taxable income.

     REITs are characterized as equity REITs, mortgage REITs and hybrid REITs. Equity REITs, which may include operating or finance companies, own real estate directly and the value of, and income earned by, the REITs depends upon the income of the underlying properties and the rental income they earn. Equity REITs also can realize capital gains (or losses) by selling properties that have appreciated (or depreciated) in value. Mortgage REITs, which only the Core Bond Portfolio may invest in, can make construction, development or long-term mortgage loans and are sensitive to the credit quality of the borrower. Mortgage REITs derive their income from interest payments on such loans. Hybrid REITs combine the characteristics of both equity and mortgage REITs, generally by holding both ownership interests and mortgage interests in real estate. The value of securities issued by REITs are affected by tax and regulatory requirements and by perceptions of management skill. They also are subject to heavy cash flow dependency, defaults by borrowers or tenants, self-liquidation and the possibility of failing to qualify for tax-free status under the Code or to maintain exemption from the 1940 Act.