OBSERVATIONS ON TACHINID PARASITOIDS (DIPTERA, TACHINIDAE) OF THE WINTER WEBWORM OCNOGYNA-BAETICA IN SPAIN (LEPIDOPTERA, ARCTIIDAE)

During 1989-XI / 1991-I, a total of 7.571 larvae, and in 1991-IV a tot al of 15 larvae of Ocnogyna baetica (Rambur 1836) field collected in S ' Spain were reared in the laboratory. 2 specimens of the tachinid Cha etogena obliquata (Fallen 1810) emerged from these collections, one fr om each 2 host larvae collected in 1991-IV. A total of 1.029 larvae of O. baetica were taken in similar collections during 1992-II/-IV. Spec imens of Tryphera lugubris (Meigen 1824), C. obliquata (Fallen 1810) a nd Gymnophryxe carthaginiensis Bischoff 1900 emerged from these larvae or from pupae. Parasitization reached a maximum of 40.6% in one host population, indicating that tachinids likely play an important role in the natural mortality of O. baetica larvae. T. lugubris is a much mor e common parasitoid of O. baetica than C. obliquata and G. carthaginie nsis.