One youth was killed and three others injured early yesterday when their car hit a telephone pole in Takoma Park, police reported.

Carlos P. Ocasio, 17, of Quebec Terrace in Silver Spring, a passenger in the front seat of the car, died at Washington Hospital Center eight hours after the accident, which occurred at 12:40 a.m. on Ritchie Avenue.

He was in the 10th grade at Montgomery Blair High School in Silver Spring.

The driver, Donald Arias, 17, whose whose home address was not released by police, suffered serious head and other injuries. Arias, who attended Blair last year, was flown by state police helicopter to Suburban Hospital and was listed in critical condition in the hospital's coronary care unit yesterday.

Passengers Paul Edwards, 17, of Silver Spring, also a Blair student, and Danny West Brown, 18, of Riverdale, were listed in stable condition at Washington Adventist Hospital in Takoma Park. A hospital spokesman said Brown suffered spinal injuries.

Takoma Park police spokeswoman Barbara Young said police believe the car was traveling south on Ritchie Avenue when it went out of control at the crest of a hill near Geneva Avenue, crossed the center line and went off the left side of the road.

Roger McGary of the Takoma Park Fire Department said the car wrapped around the telephone pole, trapping the youths about 40 minutes until rescue workers from Takoma Park, Hillandale, Wheaton and Silver Spring could remove the roof and cut the seat frames.

McGary said the youths were not wearing seatbelts.