Bones Episode Details!

Episode 4x04 "The He in the She"

When two hippies find a skeletonized wrist, Cam, Booth and Brennan, with the help of a grad student, arrive at the scene to investigate. The case turns complicated when the missing person is a female, but the DNA tests prove the wrist was from a male. Meanwhile, the lab begins to use Brennan's grad students until a permanent Forensic Anthropologist is hired.

Airs: 17th September 2008

Source: SpoilerTV