1. Manton, S. M.:The Arthropoda. Habits, functional morphology and evolution. Clarendon 1977
2. Wheeler, W. M.: Biol. Bull.42, 185 (1922)
3. Jerdon, T. C.: Madras J. Lit. Sci.17, 103 (1851)
4. Lewis, G.: L'Abeille2, 155 (1882)
5. Lefèvre, É.: Bull. Trim. Soc. Ent. France83 (1883)