Maryland's three casinos made more than $44.6 million in August, down from $48 million in July, the Maryland Lottery reported Wednesday.
Maryland Live in Anne Arundel County accounted for 73 percent of all casino profits last month. It has generated nearly $100 million since it opened the evening of June 6.
Revenue at Hollywood Casino in Perryville, the state's first slots parlor, continued to decline. In May, machines at the casino generated $10 million; in August, they generated $6.5 million, the Maryland Lottery reported.
The Ocean Downs casino on the Eastern Shore made $5.6 million last month, a small decline from July but a 24 percent increase over August 2011.
The release of August's earnings by the Maryland Lottery, which regulates all gambling in the state, comes as casino interests are spending millions of dollars on advertising ahead of a November voter referendum on expanded gambling.
Penn National Gaming Inc., which owns Hollywood Casino, has spent $5.5 million opposing the legislation. MGM Resorts Inc. has countered with $2.4 million in commercials expected to debut Wednesday. MGM intends to develop a casino at National Harbor on the Potomac, which would draw business away from Penn National's racetrack in Prince George's County and the racino it owns in West Virginia.