Outbreak of two gall midges, Harrisomyia n. gen. vitrina (Kieffer) and Drisina glutinosa Giard (Cecidomyiidae, Diptera) on maple, Acer pseudoplatanus L. in Czechoslovakia, with descriptions of the two genera and species. Journal of Applied Entomology, 101(3) 1986: 256-274. 259 [Zoological Record Volume 124]