Key to species of Antillobisium

1 Pedipalpal femur with a pronounced tubercle at base of antiaxial face........... A. vachoni Dumitresco & Orghidan, 1977

- Pedipalpal femur without a pronounced tubercle at base of antiaxial face.......................................... 2

2 Smaller, pedipalpal femur length (♂) 1.68 mm, (♀) 1.62–1.85 mm, (♂) 5.2, (♀) 4.6–5.4 times longer than broad; chela+ length (♂) 2.85 mm, (♀) 2.84–3.34 mm, (♂) 5.0, (♀) 4.5–4.8 times longer than broad........................................................................................................ A. mitchelli Dumitresco & Orghidan, 1977

- Larger, pedipalpal femur length (♂) 4.17–5.07 mm, (♀) 3.90–4.18 mm, (♂) 11.0– 11.3 times longer than broad, (♀) 10.0–10.5; chela+ length (♂) 5.68–6.24 mm, (♀) 5.12–5.42 mm, (♂) 9.8–10.3, (♀) 7.7–8.1 times longer than broad.......................................................................................................... A. tomasi n. sp.