(3804) PEARLSTONE, P.S.M., 1971. Observations on a natural population of damselfly larvae. M. Sc. thesis, Univ. Brit. Columbia, Vancouver. V+54 pp., 9 figs, 3 tabs and Appendix incl. — (Dept Zool., Biol. Sei. Cent., Univ. Alberta, Edmonton, Alberta, T6G 2E9, CA). This is the original work on which the paper listed in OA 2505 is based. (The Author’s abstracts in the 2 publications are identic).