Chrysis angustula Schenck 1856: 28. Lectotype ♀ (designated by Morgan 1984: 9); Germany: former Duchy of Nassau (SMF). Valkeila 1960: 167, Valkeila 1962: 64, Valkeila et al. 1963: 40, Erlandsson 1971: 88, Vikberg 1986b: 68, Hedström 1989: 154, Nilsson 1991: 82, Bergsten et al. 2002: 37, Söderman & Vikberg 2003: 45, Abenius 2004 a, Bergsten et al. 2004: 7, Soon 2004: 45, Soon 2004: 20, 45, Hallin 2005, Hellqvist 2006: 37, Abenius & Hellqvist 2007: 66, Salminen 2007: 141, Valtonen 2007: 20, Karlsson 2008, Abenius 2009: 59, Hallin 2009: 10, Johansson 2009, Artsdatabanken 2010, Fritz & Larsson 2010: 151, Johansson 2010: 118, Nolbrant et al. 2010: 59, Orlovskytė et al. 2010: 147, Smissen 2010d: 392, Franzén & Molander 2011: 105, Johansson 2011: 35, Molander 2011: 95, Ødegaard et al. 2011: 64, Appelqvist & Lindholm 2012: 16, Franzén et al. 2012: 27, Hallin 2012, Humala & Polevoi 2012: 142, Ranta 2012: 33, Soon et al. 2014: 307.
? Chrysis gracilis Schenck 1856: 30. Syntypes ♀♀; Germany: Weilburg (lost), nomen dubium.
Chrysis brevidens Tournier 1879: 96. Lectotype ♀ (designated by Niehuis 2000: 186); Switzerland: Peney (MHNG) (examined). Hellén 1952: 180.
Chrysis angustula angustula: Niehuis 2000: 187, Rosa & Soon 2012.
Material examined. * Latvia (total 34 exx.): Baldone; Basi; Bērze; Ērgļi, Braki; Jēkabnieki; Koknese, Bormani; Kromaniški; Langstiņi; Lipši; Ogre; Riga; Ropaži; Tērvete; Trikāta; Upesniems; Vecpiebalga; Zabludovka.
Distribution. Denmark, Estonia, Finland, * Latvia, Lithuania, Norway, Sweden, Russian Fennoscandia.—Transpalearctic. Europe, Southwest Asia, Siberia, China (Manchuria) (Linsenmaier 1997).
Remarks. Chrysis angustula is the most common cuckoo wasp species in the Nordic and Baltic countries. The northernmost records are from Finnish Lapland (Li: Inari). Old records in the literature of “ C. ignita ” probably often refer to this species. Linsenmaier (1959, 1997) used the name C. angustula gracilis for specimens with dense and fine punctation at the base of the second tergite. However, most authors have not considered gracilis to be a separate subspecies. In fact, the status of gracilis is uncertain, because the type material is lost (Niehuis 2000). In 2000, Niehuis described the subspecies C. angustula alpina based on its morphology and restricted distribution within the Alps. In northern Europe, only the nominotypical subspecies has been found.