242 
Psyche 
[September 
M. Oliver made available electrophoresis equipment and I am grate- 
ful for the photographic assistance of Messrs. P. Holland and K. 
Koths. Dr. A. Hesse kindly identified the cocoon parasites. I also 
wish to thank Mr. and Mrs. J. Coates-Palgrave for their hospitality 
and all persons who sent me specimens: Mr. G. Begg; Dr. D. 
Broadley; Messrs. B. Lamoral, J. Ledger and G. Newlands; and 
Dr. R. Smithers. I also wish to thank Professor H. W. Levi for 
his help and encouragement with all aspects of this work. The prep- 
aration of the manuscript and publication expenses were paid in part 
from National Institutes of Health Grant AI — 1944 and NSF 
grant GB — 36161 to H. W. Levi. 
References 
Abalos, J. W. 
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Kaston, B. J. 
1970. Comparative biology of American black widow spiders. Trans. 
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Levi, H. W. 
1959. The spider genus Latrodectus. Trans. Amer. Microsc. Soc. 
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1966. The three species of Latrodectus found in Israel. J. Zool. Lon- 
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McCrone, J. D. 
1967. Biochemical differentiation of the sibling black widow spiders, 
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McCrone, J. D. and Levi, H. W. 
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