1976] 
Alcock — Populations of Cent ris pallida 
131 
Rozen, J. G. 
1958. Monographic study of the genus Nomadopsis Ashmead (Hymenop- 
tera: Andrenidae). Univ. Cal. Publ. Ent. 15: 1-202. 
Shinn, A. F. 
1967. A revision of the bee genus Calliposis and the biology and ecology of 
C. andreniformis (Hymenoptera: Andrenidae). Univ. Kans. Sci. Bull. 
46: 753-936. 
