Brachymeria intermedia(Nees) was reared on its most prevalent host,Lymantria disparL., and onHolomelina lamae(Freeman), not a natural host of B.intermedia. Host acceptance levels for L.disparwere much higher than for H.lamae. Rearing on H.lamaeor adult experience with pupae of this species did not elevate its acceptability. When B.intermediawere deprived of hosts from emergence, the acceptance levels for L.disparand H.lamaeincreased with age of the parasitoid, although more so for L.dispar. In single-choice tests, H.lamaepupae contaminated with kairomone of L.disparwere accepted at the same rate as L.disparpupae. Experience with the contaminated H.lamaepupae increased the acceptance levels for clean H.lamae. The degree of polyphagy of B.intermediais discussed.