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Psyche 
[Vol. 90 
Acknowledgments 
Critical comments by G. C. Eickwort, V. J. Tepedino, and P. F. 
Torchio substantially improved and benefited our manuscript. We 
thank them for their conscientious efforts. Additionally, B. Pei- 
tersen, C. Schmitz, D. Veirs and T. Griswold rendered invaluable 
field assistance. 
References Cited 
Batra, S. W. T. 1972. Some properties of the nest-building secretions of Nomia, 
Anthophora, Hylaeus and other bees. J. Kans. Entomol. Soc. 45: 208-218. 
1980. Ecology, behavior, pheromones, parasites and management of 
sympatric vernal bees Colletes inaequalis, c. thoracicus and C. validus. J. Kans. 
Entomol. Soc. 53:509-538. 
Cane, J. H. 1981. Dufour’s gland secretion in the cell linings of bees (Hymenop- 
tera: Apoidea). J. Chem. Ecol. 7:403-410. 
Eickwort, G. C., R. W. Matthews, and J. Carpenter. 1981. Observations on 
the nesting behavior of Megachile rubi and M. texana with a discussion of the 
significance of soil nesting in the evolution of megachilid bees (Hymenoptera: 
Megachilidae). J. Kans. Entomol. Soc. 54:557-570. 
Frohlich, D. R. 1982. The biology and ecology of Eumegachile (Sayapis) pug- 
nata (Say) (Hymenoptera: Megachilidae), a pollinator of commercial sun- 
flower. M.S. Thesis. Utah State University, Logan, Utah. 1 10 pp. 
1983. On the nesting biology of Osmia (Chenosmia) bruneri Cockerell 
(Hymenoptera: Megachilidae). J. Kans. Entomol. Soc. 56: 123-'130. 
Hurd, P. D., Jr. 1979. Superfamily Apoidea. Pp. 1741-2209 in K. V. Krombein, 
P. D. Hurd, Jr., D. R. Smith, and B. D. Burks, eds. Catalog of Hymenoptera in 
America North of Mexico. Smithsonian Institution Press, Washington. 
Krombein, K. V. 1967. Trapnesting wasps and bees: life histories, nests, and 
associates. Smithsonian Press, Washington, 570 pp. 
Medler, j. T. 1964. A note on Megachile (Sayapis) pugnata pugnata Say in 
trap-nests in Wisconsin (Hymenoptera: Megachilidae). Can. Entomol. 96 : 
918-921. 
Michener, C. D. 1974. The social behavior of the bees. Harvard University 
Press, Cambridge, Massachusetts. 404 pp. 
Mitchell, T. B. 1981. A generic revision of the megachiline bees of the Western 
Hemisphere. Cont. Entomol. Dep. N. Carolina State University, Raleigh. 95 
PP- 
Parker, F. D. and D. R. Frohlich. 1983. Hybrid sunflower pollination by a 
manageable composite specialist: The sunflower leafcutter bee (Hymenoptera: 
Megachilidae). Environ. Entomol. 12 : 576-581. 
Parker, F. D. and V. J. Tepedino. 1982. The behavior of female Osmia margi- 
nata Michener in the nest (Hymenoptera: Megachilidae). Pan-Pac. Entomol. In 
press. 
