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The Eucharitidae Orasema xanthopus (Cameron) and the ant Solenopsis daguerrei (Santschi) are natural enemies of the fire ants Solenopsis. The first species is a parasitoid of S. invicta Buren and Solenopsis sp. saevissima-complex (Heraty, 1994); the other is a social parasite of S. invicta, S. macdonaghi (Santschi) (Briano et al., 1997), and S. richteri Forel (Silveira-Guido et al., 1973). These two species are native to South America and have been considered as potential control agents of the fire ant S. invicta introduced 70 years ago into the USA (Wojcik, 1986). The objective of this study is to amplify the knowledge of the geographical distribution of these insects in Brazil, as well as to verify their association with S. saevissima (Fr. Smith). Hundreds of fire ant nests were opened in 2001 in S. saevissima and S. invicta territories (Goiás and São Paulo states) in order to determine whether or not these natural enemies were present. Only adult individuals were considered. Complementary data on geographical distribution were obtained in collection references. Several individuals of O. xanthopus and S. daguerrei were collected with an aspirator and preserved in 70% alcohol. The fire ant species were identified using Trager ́s key (1991). O. xanthopus and S. daguerrei were identified using the key of Heraty et al. (1993), and the Briano et al. (1997) material comparison, respectively. Six females of O. xanthopus were observed attacking two colonies of S. saevissima [Goiânia, GO (17oS, 49oW) and Luiz Antônio, SP (21oS, 48oW)]. Reference data of collections show that this species also occurs in Descalvado, SP (22oS, 47oW). Several males and winged queens of S. daguerrei were observed in only one S. invicta colony in Anhembi, SP (23oS, 48oW). Both species of natural enemies were rare compared with Pseudacteon parasitoid occurence (Pesquero and Penteado-Dias, unpublished). The inclusion of S. saevissima in the host list of O. xanthopus extends its distribution into the territory of this fire ant species. Apparently, S. daguerrei does not use S. saevissima as a host, and is principally limited to S. invicta territory.

New Records of Orasema xanthopus (Hymenoptera: Eucharitidae) and Solenopsis daguerrei (Hymenoptera: Formicidae) from Brazil