Langley Collyer was found dead yesterday in his old brownstone home at 2078 Fifth Avenue. His body, wedged in a booby trap set to keep out intruders, was lying in the same room on the second floor where his blind brother, Homer, had been found dead on March 21.

The time of his death was not fixed by the medical examiner pending an autopsy today at the morgue, but the police were sure that the eccentric 61-year-old recluse had died at least three weeks ago. The cause of death was unknown, but he apprarently starved or suffocated, unable to get out of his own trap.

Langley's body was found in a mazelike tunnel just inside the hallway entrance to the room. He was lying on his right side, his head turned toward the front space where his paralyzed older brother spent his time. He apparently was carrying food to his ailing brother, whom he had carefully nursed since Homer was stricken in 1932. His body was ten feet from where Homer had been found.

Piles of newspapers, books, tin cans and old furniture filled the room.