1974] 
Cooper — Boreus 
1 15 
can attack its host only during periods of dampness when the larva 
of Boreus is free to move about; since the parasite pupates, or may 
enter diapause, enclosed within the cell of its host larva, parasite and 
host are thereby synchronized to the same periods of activity. The 
very means by which the larvae of B. notoperates withstands drought 
thus entrains the parasite to the host’s timetable. 
Acknowledgment 
I wish to thank those who have helped me in various ways during 
the course of this work. Especial thanks are extended to Prof. Lewis 
E. Anderson, of Duke University, for his cheerful acceptance of the 
numerous samples of mosses sent him over the years for identification. 
Other plants, still to be mentioned, were collected and identified by 
Mr. J. W. Stubblefield to whom I owe special thanks. Both he, and 
my wife, Dr. Ruth S. Cooper, gave me much help with field work 
that, at times, I could not otherwise have carried out. Prof. Earle 
A. Cross, of Northwestern State College, La., made the identification 
df the phoretic mite. Prof. G. W. Byers, of the University of Kan- 
sas, obtained for me Tarbinsky’s and Vlasov’s articles, not available 
in this country, from a Russian colleague. Prof. Peter Jorgensen, of 
the University of California at Riverside, helped me with the Scandi- 
navian articles, and as before I have been assisted with Russian works 
by both Prof. Anatole Forostenko, also of U. C. R., and my son 
Geoffrey K. Cooper. Errors of interpretation, if any, are however my 
sole responsibility. Finally, it is a pleasure to acknowledge my con- 
siderable indebtedness to Prof. Frank M. Carpenter, of Harvard 
University, whose unsolicited kindnesses in sending me specimens and 
literature otherwise unavailable to me, and in other ways, have been 
of such help in the work on Boreus and other studies. 
Literature Cited 
Atchley, W. R. and R. C. Jackson 
1970. Cytological observations on spermatogenesis in four species of 
Mecoptera. Canad. Jour. Gen. Cytol. 12: 264-272. 
Aubrook, E. W. 
1939. A contribution to the biology and distribution in Great Britain 
of Boreus hy emails (L.) (Mecopt., Boreidae). Jour. Soc. Brit. 
Ent. 2: 13-21. 
Boese, A. E. 
1973. Descriptions of larvae and key to fourth instars of North Ameri- 
can Panorpa (Mecoptera: Panorpidae). Univ. Kansas Sci. Bull. 
50: 163-186. 
