Parasitism of three species ofBrochymena,B. arborea(Say),B. cariosaStål andB. sulcataVan Duzee, byTrichopoda plumipes(Fabricius) was studied in College Station, Tex. Percent parasitism and number of eggs per parasitized host were essentially the same for males and females and for the three host species, except that the mean number of eggs on parasitized hosts was higher forB. sulcatathan forB. cariosa. Overall, hosts collected on black willow,Salix nigraMarshall, and cottonwood,Populus deltoidesMarshall, were more heavily parasitized and showed a higher number of parasite eggs than did those hosts collected on American elm,Ulmus americanaL., or Chinese elm,U. pumilaL.Trichopoda plumipesshowed a marked preference for the abdominal tergites and hind wings as oviposition sites. Of those eggs found, 91% were located on tergites and other areas which were hidden from view by the forewings when the host was at rest, and 97% of the eggs were deposited on the dorsal surface of the host. A relatively low percentage of those hosts bearing hatched tachinid eggs had parasite larvae internally.