Citation (MLA Form): Barnes, H. F. “The Gall Midges of St. John’s Wort (Hypericum Spp.), with Descriptions of Two New Species.” Bulletin of Entomological Research, vol. 42, no. 4, Jan. 1952, pp. 697–705, 10.1017/s0007485300029084. Accessed 2 June 2021.