Five species of acanthocephalans of the family Centrorhynchidae are recorded from birds in Bulgaria: Centrorhynchus amphihius Das, 1950 from Buteo buteo (L.) (new host record), C. glohocaudatus (Zeder. 1800) Luhe, 1911 from Falco tin-nunculus L. and F. vespertinus L, (new host record), Sphaerimstris picae (Rudolphi, 1819) Golvan, 1960 from Pica pica (L.) and Lanius excuhitor L. (new host record), S. lancea (Westrumb, 1821) Golvan, 1960 from Vanellus vanellus (L.), and S. turili (Yamaguti, 1939) Golvan, 1960 from Turdus merula L„ Cinclus cinclus (L.) (new host record) and Stumus vulgaris L. (new host record). New geographical record for Europe is this of C. amphihius, and for Bulgaria - this of S. lurdi. The species are described and figured on the basis of Bulgarian specimens. Sphaerimstris picae is recognized as a valid species and S. teres is considered its synonym. A male of S. picae with a copulatory cap is reported.
Dictyterina cholodkowskii (Skrjabin, 1914) is recorded from iMnius collurio L. in Bulgaria (new geographical record). The species is redescribed and figured. A full list of synonyms is presented; it includes, among the other synonyms, Deltokeras delachauxi Hsii, 1935 (new synonym), Biulerina passerina of Oshmarin (1963) and Paruterina parallelipipeda of Paspalev and Paspaleva (1972). A survey of published records characterizes D. cholodkowskii as limited to the Palaearctic in six species of the genus Lanius (Aves, Passeriformes, Laniidae).