Catalog of the Diptera of the Oriental Region, A. Volume 1. Suborder Nematocera, compiled and edited by Mercedes D. Delfinado and D. Elmo Hardy. 618 pages. The University of Press of Hawaii, Honolulu. 1973. $18.50.

Evaluation of Environmental Health Programmes. Report of a WHO Scientific Group. WHO Technical Report Series No. 528, 64 pages. 1973. $1.50.

Flies and Diseases. Volume II. Biology and Disease Transmission, by Bernard Greenberg. x + 447 pages, illustrated. Princeton University Press, Princeton, New Jersey 08540. 1973. $18.00.

Principles of Immunology, edited by Noel R. Rose, Felix Milgrom, and Carel J. van Oss. x + 468 pages, illustrated. Macmillan Publishing Co. Inc., 866 Third Avenue, New York 10022. 1973. $14.95 hardcover; $9.95 paperback.

Tumours in a Tropical Country, edited by A. C. Templeton. Recent Results in Cancer Research, Volume 41. xii + 345 pages, illustrated. Springer-Verlag, New York, Inc., 175 Fifth Avenue, New York 10010. 1973. $32.40.