Preliminary Catalogue of British Cecidomyidae. 411 Northumberland, near Warkworth. Durham, coast between Horden and Hart. *420. Cecidomyid sp. Bagnall and Harrison, 1918, p. 61. On Achillea Ptarmica. Yorkshire, Bardsey near Leeds. *421. Cecidomyid sp. Hoiiard, 5450. On Knautia arvensis, leaf pustules. Northumberland, Ovington. Durham, Ryhope. *422. Cecidomyid sp. Houard, S. 60. On Salix. Northumberland, Ovingham on S. aurita. Durham, Easington on S. Caprea. *423. Cecidomyid sp. Bagnall and Harrison, 1918, p. 61. In rotting turnips. Durham, Birtley. II. Check List of Named Species. CECIDOMYIDAE. Subfamily CECIDOMYINAE. Group Lasiopterariae. Genus Clinorrhyncha H. Loew. 1. C. chrysanthemi H. Loe«'. 2. C. millefolii Waclitl. 3. C. leucanthemi Kieffer. Genus Trotteria KiefTer, = Choristonevra (praeocc.) Rubs. 1. T. gain Riibsaamen. 2. T. sarothamm (Kieffer). .3. T. umhelUJ'erarum Kieffer. Genus Baldratia Kieffer. 1. B. salicorniae Kieffer. Genus Stefaniella Kieffer. 1. 8. brevipalpis Kieffer. Genus Lasioptera (Meigen). 1. L. albipennis Meigen. 2. L. arundinis Schiner. 3. L. cAilamagroslnlis Riibsaa-men. 4. L. carophila ¥. Loew. 5. L. rubi Heeger. Group OLIGOTROrHARIAE. [Genus Neocerata Coquillet — Ferrisia. 1. N. rhodophaga C!oquillett.
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