280 
Psyche 
[Vol. 95 
web and then constructed a unique cocoon beset with long, erect 
hairs of uniform length. Morphological adaptations that may assist 
the wasp in hunting and prey entanglement are discussed. Key 
words: Allochares azureus, Filistata hibernalis, Pompilidae, Fili- 
statidae, Parasitoid, Host-parasitoid interaction, Behavior, Adap- 
tations 
Acknowledgments 
We gratefully acknowledge Nancy Deyrup for the photographs 
used in this paper. We thank Glen Woolfenden (University of South 
Florida), Thomas Eisner (Cornell University), Shirley Denton, 
James Layne, Fred Lohrer, and James Wolfe (Archbold Biological 
Station) for reviewing the manuscript. 
Literature Cited 
Charnov, E. L. 1982. The theory of sex allocation. Princeton, N.J. Princeton 
University Press, x + 355 pp. 
Clausen, C. P. 1939. The effect of host size upon the sex ratio of hymenopterous 
parasites and its relation to methods of rearing and colonization, J. N.Y. 
Entomol. Soc. 47: 1-9. 
Deyrup, M., and D. Manley. 1986. Sex-biased size variation in velvet ants 
(Hymenoptera: Mutillidae). Fla. Entomol. 69: 327-335. 
Evans, H. E. 1951. A taxonomic study of the Nearctic spider wasps belonging to 
the tribe Pompilini (Hymenoptera: Pompilidae). Part III. Trans. Amer. 
Entomol. Soc. 77: 203-340. 
Evans, H. E. 1953. Comparative ethology and the systematics of spider wasps. 
Syst. Zool. 2: 155-172. 
Evans, H. E. 1959. The larvae of Pompilidae (Hymenoptera). Ann. Entomol. 
Soc. Amer. 52: 430-444. 
Evans, H. E. 1966a. A revision of the Mexican and Central American spider 
wasps of the subfamily Pompilinae (Hymenoptera: Pompilidae). Mem. Amer. 
Entomol. Soc. 20 : 1-442. 
Evans, H. E. 1966b. Some unusual prey records for Pompilidae. Proc. Entomol. 
Soc. Wash. 60 : 339. 
Evans, H. E., and C. M. Yoshimoto. 1962. The ecology and nesting behavior of 
the Pompilidae (Hymenoptera) of the northeastern United States. Misc. Pub. 
Entomol. Soc. Amer. 55: 5-15. 
Iwata, K. 1942. Comparative studies on the habits of solitary wasps. Tenthredo 
4 : 1-146. 
Kaston, B. J. 1959. Notes on pompilid wasps that do not dig burrows to bury 
their spider prey. Bull. Brooklyn Entomol. Soc. 54 : 103-1 13. 
Levin, D. A. 1973. The role of trichomes in plant defense. Quart. Rev. Biol. 48 : 
3-15. 
