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Goedenia stenoparia (Steyskal) is an oligophagous, multivoltine fruit fly (Diptera: Tephritidae) that feeds in the flower heads of hosts belonging to the family Asteraceae, tribe Astereae, and subtribe Solidagininae, like all other known hosts of Goedenia spp. Newly reported hosts are Ericameria parishii (E. Greene) H. M. Hall, Gutier-rezia calfornica (de Candolle) Torrey and A. Gray. Hazardia squarrosa (Hooker and Arnott) E. Greene. Lessingia glandulifera A. Gray, and Solidago californica Nuttall. Variations in taxonomic characters of adults are described. The third-instar larvae and puparia are described and figured. and selected characteristics of these stages are compared with the same stages of three other species of Goedenia. The prothorax and gnathocephalon of the third instar is smooth and mostly free of the minute acanthae that circumscribe most other body segments. The third instar of G. stenoparia lacks oral ridges, as do the third instars of three other congeners studied to date. The anterior thoracic spiracle bears two papillae. Minute acanthae cover the center of the truncated, posteriorly sclerotized, caudal segment, that also is perforated by scattered pores, and this central area is ringed by concentric. incomplete series of shallow, elliptical depressions. The life cycle is of the aggregative type. Overwintering limitedly occurs as sexually immature adults, but mainly in dead flower heads as prepuparial third instars and puparia in apically open, vasiform cells consisting of floret and achene fragments glued together with dried liquid feces and sap. Overwintered puparia of G. stenoparia were parasitized by chalcidoid Hymenoptera in the genera Eurytoma (Eurytomidae), Pteromalus (Pteromalidae), and Torymus (Torymidae) as probable, primary, solitary. larval-pupal endoparasitoids.