At least eight persons were fatally injured in unrelated auto accidents in Maryland over the Labor Day weekend, more than double the number during the holiday last year. Virginia state police reported seven traffic fatalities compared with 16 for the same period last year.

There were no fatalities reported in the District. Maryland had one presumed drowning.

Gregory Ransom, 29, of Arlington, died at 1:15 a.m. yesterday when his motorcycle slammed into the back of a tow truck on southbound I-95 near Oxon Hill.

The tow truck, reportedly with its emergency lights on, was trying to help a disabled vehicle. Investigators said alcohol, driver error and speed were factors in the mishap.

State police said William Shorter, 27, of Adelphi died when his car crashed into a tree in a rural area of Prince George's County at about 11:10 p.m. Saturday.

In Charles County, police said, Christina Wright, 10, of Bryans Road, was killed when she rode her bicycle through a stop sign into the path of an oncoming car.

Elizabeth Bush, 24, of Laurel died when her car ran off the right side of Stanfield Road in that town Saturday evening. Authorities said the mishap was alcohol-related.

David Suggs, 25, of Bel Air died early Saturday morning when his car ran off U.S. Rte. 40, near Perryville in Cecil County. Police said alcohol was a factor in the accident.

Police said Rodney Teat Jr., 25, of Middletown, Del., was killed when he apparently fell asleep at the wheel Saturday morning on Rte. 310 near Chesapeake City in Cecil County.

Elsewhere yesterday, Thomas A. Dixon, 12, of Glen Burnie, was fatally injured shortly after 4 p.m. when he ran from between parked cars into the path of a motorcycle, and Alan L. Hines, 33, of Dundalk, was killed when the motorcycle he was riding crashed into a guardrail about 8 p.m. at Broening Road and Dundalk Avenue in Dundalk.

Maryland Natural Resources police searched the waters near the Chesapeake Bay Bridge over the weekend for Daniel Paul Valley, 27, of Glen Burnie, Md., who was presumed drowned after an early morning boating accident Saturday.

In Virginia, state police reported these fatal accidents:

*Fernando Flores Balatbat, 39, assigned to the USS Oak Ridge, died at the scene of a 7:50 a.m. crash Sunday on U.S. Rte. 58 near Rte. 650 in Southampton County. Police said Balatbat was killed when his car ran off the highway and struck a tree.

*Doris Young, 55, of Norfolk, died at 11:08 p.m. Saturday at Norfolk General Hospital. The car in which she was riding had jumped the curb of a Norfolk city street and run into a light pole about 2 1/2 hours earlier.

*Mark Charlie Irving, 69, of Alton, died at the scene of an accident in Halifax County at 8:25 p.m. Saturday. He was a passenger in a car that ran off the right side of Rte. 751, struck a tree and overturned.

*Elverd Columbus McLamb II, 24, of Tampa, Fla., was riding his motorcyle on U.S. Rte. 17 in York County when he collided with a truck Friday. He died at Newport News General Hospital at 6:36 p.m. Saturday.

*Steven J. James, 24, of Virginia Beach, was killed at 1:27 p.m. Saturday in Norfolk when he failed to negotiate a turn with his motorcycle and smashed into a building.

*Jerry Wayne Fitzgerald, 37, and James A. Seal, 35, both of Lynchburg, died instantly when they stepped in front of a car driving on Rte. 501 in Campbell County at 1 a.m. Saturday.