The cosmopolitan genus Anagrus Haliday is one of the largest in Mymaridae (Hymenoptera: Chalcidoidea), and includes very common egg parasitoids, mostly of leafhoppers. The smallest species (body length: 0.4-0.6 mm) are found in the atomus species group. This group at present includes about 20 species worldwide. Anagrus atomus (Linnaeus) is among the most common species in the Palaearctic region. Other populations very similar in morphology and biology to this species are also widespread and associated with several leafhoppers infesting wild and cultivated plants (Matteucig & Viggiani 2008). Some specimens of these populations were identified as A. ustulatus Haliday by Chiappini (1989), who presumably followed Graham (1982).