The NYPD has released a blurry picture that authorities hope will help identify him.
The incident happened at a bus stop on Forest Avenue on Sunday, August 11, just before 11 p.m.
Police say the man put a knife up to the 41-year-old woman's back and threatened to take her 4-year-old daughter if she didn't give up her bag, which she did.
The suspect then fled on foot towards Barrett Avenue.
No injuries were reported.
The suspect is described as a Hispanic male, approximately 30 years old, standing about 5-foot-5 and weighing about 200 pounds with a stocky build. He was last seen wearing a baseball cap, black T-shirt, black and white sneakers and gray shorts.
Anyone with information in regards to this incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477).