Two new species of Xanthomicrogaster (Hymenoptera: Braconidae) from Argentina, with a key to species of the genus Author Martínez, Juan José Author Riverón, Alejandro Zaldívar text Zootaxa 2018 2018-01-11 4370 3 295 300 journal article 31030 10.11646/zootaxa.4370.3.10 e0b357c8-e3b7-4493-b74f-ac40de7336f9 1175-5326 1145519 1150E2D8-54C4-45BA-8E4F-92D2D6FA661F Key to described species of Xanthomicrogaster (Modified from Penteado-Dias et al. 2002) 1. Mesosoma largely yellow (if dark spots are present, they are restricted to a single small sclerite).................................................. 2 - Mesosoma partly black; with distinct black markings on various sclerites, sometimes entirely black ............................................ 3 2. Mesosoma entirely yellow (sometimes with darkened apicolateral corners of propodeum); second metasomal tergum poorly sculptured, almost smooth; Brazil , Guyana , Suriname ...................................................................................... X. fortipes Cameron - Mesosoma yellow with a distinct dark brown to black spot covering most of scutellum; second metasomal tergum rugose; Argen- tina ...................................................................................................................................................... X. otamendi Martínez sp. nov. 3. Mesosoma and hind coxa completely black; Brazil................................................................................................. X. pelides Nixon - Mesosoma and hind coxa partly yellow ........................................................................................................................................... 4 4. Hind coxa blackish ventrally; second tergite blackened; Mexico............................................................................... X. seres Nixon - Hind coxa yellow ventrally; second metasomal tergite completely yellow ......................................................................................5 5. Median lobe of mesoscutum partially black, metasoma black dorsally beyond tergite II; Brazil ...................................................... .......................................................................................................... X. maculatus Penteado-Dias, Shimabukuro & van Achterberg. - Median lobe of mesoscutum and metasoma entirely yellow; Argentina .............................................. X. sayjuhu Martínez sp. nov.