Ten species of hymenopterous parasites were reared from logs of pine and cypress, naturally infected with 5 species of bark beetles, viz., Orthotomicus erosus Woll., Pityogenes calcaratus Eichh., and Tomicus destruens Woll. - on pine; Phloeosinus armatus Reitt. and P. aubei Perris - on cypress, in Israel. The parasites were : Dendrosoter chaenopachoides Rusch., D. hartigii (Ratz.), D. middendorfi (Ratz.), D. protuberans Nees (Braconidae ), Eurytoma morio Boheman (Eurytomidae ), Cerocephala eccoptogastri Masi, Heydenia pretiosa Foerster, Metacolus unifasciatus Foerster, Rhaphitelus maculatus Walker and Roptrocerus xylophagorum (Ratz.) (Pteromalidae ). The most common were M. unifasciatus on pine and cypress, D. chaenopachoides and R. xylophagorum on pine, and D. protuberans on cypress, occurring in samples collected during most seasons. Less common was E. morio , which was reared from both conifers. D. middendorfi was found on pine, and only during winter. The other species were found only occasionally.