The two skins having the darkest pelage are both of males and are the only two skins having open epiphyseal sutures.
"Neotropical Bats from Northern Mexico"
Sydney Anderson
W Chapala, 5000 feet, on July 12, 1949. Each specimen of A. jamaicensis listed above lacks epiphyseal sutures and both an upper and a lower third molar on each side.
"Neotropical Bats from Northern Mexico"
Sydney Anderson