Authors give report on the results of collection carried out between 1999 and 2002 on various trees and shrubs in Budapest and its surroundings, in Diósjenô and in Pilicsév. Out of the 29 woody plant species studied lachnid species were found on 19. A total of 17 lachnid species were identified belonging to 6 genera (Schizolachnus, Tuberolachnus, Eulachnus, Stomaphis, Lachnus and Cinara). Stomaphis mordvilkoi Hille Ris Lambers, 1933 is new for the Hungarian fauna. Of the 10 ant species attended lachnids Lasius niger (Linneus, 1758) was the most frequent.