Survey of aphids on dicotyledonous herbaceous plants along the Hungarian highways on 33 sampling points revealed the presence of four holocyclic Brachycaudus species. The monoecious B. lychnidis L. 1758 was the most frequently collected species. It colonised the perennial Silene alba (Mill.) E. H. L. Krause 1893 on the youngest highway section around Budapest (5 locations). The frequency of this species is due to frequent occurrence of its host plant on this section compared to other host species. New record for the Hungarian fauna is the occurrence of monoecious B. setosus Hille Ris Lambers 1948 on the biennial or perennial Tragopogon orientalis L. 1753 on two locations on the southern part of the country. The heteroecious B. cardui L. 1758 was found on biennial or perennial Senecio jacobaea L. 1753 in one location on north-western part of Hungary. On the north-eastern part of the country the perennial Symphytum officinale subsp. bohemicum (F. W. Schmidt) Čelak 1891 occurred on a damp area. The monoecious B. mordvilkoi Hille Ris Lambers 1931 colonised this Boraginaceae species.