1. Batra (S. W. T.), 1966.—Nests and social behavior of halictine bees of India.India J. Entomol.28 (4) (in press).
2. Batra (S. W. T.) andMichener (C. D.), 1966.—Nest and description of a new bee,Systropha punjabensis from India.J. Kansas Entomol. Soc.,39, 4 (In press).
3. Cross (E. A.) andBohart (G. E.), 1960.—The biology ofNomia (Epinomia) triangulifera with comparative notes on other species ofNomia, Univ. Kansas Sci. Bull.,41, 6, p. 761–792.
4. Gutbier (A.), 1915.—Essai sur la classification et sur le développement des nids des guèpes et des abeilles.Horae Soc. Ent. Rossicae,41, 7, p. 1–56, pl. I–II.
5. Hirashima (Y.), 1961.—Monographic study of the subfamily Nomiinae of Japan (Hymenoptera, Apoidea).Acta Hymen.,1, 3, p. 241–303.