A new species of Pachysvastra Moure & Michener (Hymenoptera: Apidae) discovered in Argentina Author Alvarez, Leopoldo J. 0000-0003-4330-9617 División Entomología, Museo de La Plata, Universidad Nacional de La Plata, Edificio Anexo Museo, Unidades de Investigación FCNyM, 122 y 60, 1900 FWA, La Plata, Argentina, CONICET. lalvarez@fcnym.unlp.edu.ar Author Lucia, Mariano 0000-0001-8019-6768 División Entomología, Museo de La Plata, Universidad Nacional de La Plata, Edificio Anexo Museo, Unidades de Investigación FCNyM, 122 y 60, 1900 FWA, La Plata, Argentina, CONICET. mlucia@fcnym.unlp.edu.ar text Zootaxa 2024 2024-06-19 5471 3 391 397 http://dx.doi.org/10.11646/zootaxa.5471.3.9 journal article 298738 10.11646/zootaxa.5471.3.9 3b60f77d-1302-44a3-977f-ec6aaa58a7c9 1175-5326 12190274 4B8FCF60-4138-4051-8BD8-22A109EA3A71 Key to species of Pachysvastra females 1. Clypeus black ( Fig. 4a ); mesosoma, metatibia, and metabasitarsus with black pilosity ( Fig. 4b )........... P. leucocephala - Clypeus with a subapical yellow band ( Figs 1b , 4c ); mesosoma with yellow pilosity or with whitish intermixed with black hairs; metatibia and metabasitarsus with yellowish pilosity ( Figs. 1a , 4d ).............................................. 2 2. Vertex and mesosoma with yellow pilosity, pronotal lobe with yellow hairs ( Figs. 4c, 4d ). T1–T4 with a narrow (~1× MOD long) translucent light brown marginal band; interocellar distance longer than ocellocular distance (1.16:1)... P. flavofasciata - Vertex and mesosoma with mixed white and black pilosity, pronotal lobe with a distinct tuft of long, black hairs ( Fig. 1a ). T1- T4 with a broad (1.3–1.6× MOD) translucent light brown marginal band ( Fig. 1c ); interocellar distance shorter than ocellocular distance (0.9:1)................................................................. Pachysvastra luquita sp. n.