PROC. ENTOMOL. SOC. WASH. 96(2), 1994, pp. 281-287 ANALYSIS OF KNOWN AND NEW HOST RECORDS FOR PAROXYNA FROM CALIFORNIA (DIPTERA: TEPHRITIDAE) Richard D. Goeden Department of Entomology, University of California, Riverside, California 92521. Abstract. —Thiny -seven new rearing records from mature flower heads of Asteraceae are reported for nine of the 19 species o^ Paroxyna now known from California. Paroxyna coloradensis Quisenberry is newly reported from California. Hosts remain unknown for seven species and unconfirmed for two species. The host-plant relations for 12 species for which hosts now have been reported are analyzed and compared for the first time. Seven species apparently are monophagous or nearly monophagous, being restricted to a single host genus or known only from one to several, congeneric hosts. Three are oli-gophagous species reported from more than one host genus in a single tribe. Paroxyna genalis (Thomson) appears to be the sole generalist among California species, and is now known from 16 genera and 38 species of host plants representing six tribes of Asteraceae. The hosts of Paroxyna in California represent eight tribes of Asteraceae: Anthemideae, Astereae, Cichorieae, Eupatorieae, Helenieae, Heliantheae, Inuleae, and Senecioneae. The Anthemideae and Eupatorieae are each represented by a single host-plant species for two different monophages. Five California Paroxyna spp. may attack only Astereae, the largest of 12 tribes of Astereae in California. Key Words: Insecta, Paroxyna, Tephritidae, Asteraceae, flower-head feeders, host-plant specificities, monophagy The genus Paroxyna. together with the genera Neaspilota. Tephritis. Trupanea. and Uropliora. comprise the bulk of the native, nonfrugivorous fruit flies (Diptera: Tephrit-idae) extant in California (Foote and Blanc 1963, Foote et al. 1993, Goeden 1993, un-published data). Host plants of California tephritids in the latter four genera were re-ported, compiled, and analyzed bv Goeden (1985, 1987, 1989, 1992, 1993); and Goe-den and Blanc (1986) provided an abbre-viated account of hosts of two species of Paroxyna. Publication of the handbook on North American Tephritidae by Foote et al. (1993) inspired and facilitated the present analysis of known and new host plants of Paroxvna from California. Because Parox-yna species are difficult to identify, locate, sample, and study in nature, this analysis of my admittedly meager findings of the past 13 years on the host-plant relations of this genus may otherwise have gone unreported. Companion life-history studies of selected species of California Paroxyna eventually will be reported separately beginning with P. genalis (Thomson) (Goeden, Headrick, and Teerink, unpublished data). Materials and Methods Materials and methods used were de-scribed by Goeden (1985. 1992). Voucher species of tephritids reside in my research collection; pressed voucher specimens of uncommon or otherwise poorly represented
BioStor
