none The parasitoid complex of the gall-inducing midge Giraudiella inclusa (Dipt., Cecidomyiidae), which induces "ricegrain"-galls in shoots of the grass Phragmites australis, comprised fourteen species (six Aprostocetus spp., Eulophidae; one Torymidae; two Eurytomidae; two Pteromalidae; two Platygasteridae; one Braconidae). Host records are new for Aprostocetus longiscapus, A. phragmiticola, A. spec., Platygaster cf. quadrifarius, Bracon fulvipes, and the hyperparasitoid Spaniopus peisonis. An identification key based on gall sections and larval characters is given. Biological features enabling differential resource utilization are shown for each of the hymenopterous parasitoids. All but two rare species appeared to be monophagous wasps that killed midge larvae. Twelve species oviposited in host larvae, the two Platygaster spp. oviposited in host eggs. Six of the fourteen species were rare. Temporal distribution of parasitoids is shown by number of adults captured by sweep-netting (fig. 2). Variations of life-spans were tested showing (i) that the gregarious endoparasitoids lived longer than the solitary ectoparasitoids and (ii) that females lived almost twice as long as males (table 2). Stepwise multiple regression showed that variations in both abundance and percent parasitism of the eight most common species could be explained by the number of attacked internodes, but not by the number of parasitized galls per attacked internode (table 1). Multivoltine species were 2.5 times more abundant than univoltine species.