World Cynipoidea (Hymenoptera): A Key to Higher- Level Groups Author Buffington, Matthew L. Systematic EntomologyLaboratory, ARS-USDAc / oNational Museumof NaturalHistory, SmithsonianInstitution, 10 th & Constitution Ave NW, Washington, DC 20013, USA, matt.buffington@usda.gov Author Forshage, Mattias Department of Zoology, Naturhistoriska Riksmuseet, Box 50007, SE- 104 05 Stockholm, Sweden, Author Liljeblad, Johan Swedish Species Information Centre, PO Box 7007, SE- 750 07 Uppsala, Sweden, Author Tang, Chang-Ti Department of Biological Sciences, The George Washington University, SEH, Suite 6300, 800 22 nd Street, NW, Washington, DC 20052, USA, Author Noort, Simon van Research and Exhibitions Department, South African Museum, Iziko Museums of South Africa, P. O. Box 61, Cape Town 8000, South Africa, text Insect Systematics and Diversity 2020 2020-07-01 4 2020 1 1 69 http://dx.doi.org/10.1093/isd/ixaa003 journal article 10.1093/isd/ixaa003 2399-3421 4552110 Eschatocerini Figs. 211–213 This monotypic tribe may feel unsatisfactory for taxonomy, but its erection is based on phylogeny ( Ronquist et al. 2015 ). This unusual group can be readily collected when host plants are located; otherwise, the taxon is rarely collected. Biology. Species are gall inducers on Prosopis spp. and Acacia spp. ( Fabaceae ) in South America. Distribution. Arid regions of the Neotropics. Relevant literature.Nieves-Aldrey and San Blas (2015) revised the tribe and described the biology in depth; Ronquist (1995b) and Ronquist et al. (2015) studied the phylogenetic placement of the group. Classification. Eschatocerini Ashmead, 1903 Eschatocerus Mayr, 1881 ; 3 species NT