Freeman, P., 1956. Two new species of Mycetophilidae (Diptera: Nematocera) from Britain. Proceedings of the Royal Entomological Society of London. Series B, 25, pp.26-28. Available at: http://www.online-keys.net/sciaroidea/1951_60/Freeman_1956_Sciophila_buxtoni_Phronia_sinuata_sp_n.pdf.