Check List of the Cecidomyidae of New Zealand By H. F. Barnes, M.A., Ph.D., Rothamsted Experimental Station, Harpenden, England. [Read before the Auckland Institute, March, 1937; received by the Editor, March 31, 1937; issued separately. September, 1937.] Introduction. This list is intended to supplement the author's check list of the Cecidomyidae of Oceania. * Check List of the Cecidomyidac of Oceania: Bernice P. Bishop Museum, Occasional Papers, 1937. Up to the present thirty-four species, one of which has not yet been determined, have been recorded and these belong to thirteen genera. Most of these genera are of world-wide distribution, the exception being Stephodiplosis Tavares which had been found only in Mozambique, Africa. Of the species five undoubtedly have been introduced and are of economic importance, namely Dasyneura alopecuri (Reuter) and Stenodiplosis geniculati Reuter, two of the meadow foxtail grass midges; Dasyneura pyri (Bouché), the leaf-curling pear midge; Mayetiola destructor (Say), the Hessian fly; and Contarinia tritici (Kirby), one of the wheat-blossom midges. The last-named species has only been incidentally reported by Cockayne (6) in a paper dealing with D. alopecuri and this record is not entirely satisfactory. The only other three species of economic importance are Oligotrophus oleariae (Maskell), the Olearia † The correct name and synonymy of the native Olearia shrub are Shawia paniculata Cheesem. (Olearia Forsteri Hook. f., Olcaria paniculata Cheesem.). bud-gall midge; Dryomyia shawiae Anderson, another Olearia midge and the undetermined species of Arthrocnodax which is a natural enemy of the European red-mite, Paratetranychus pilosus. The morphology and anatomy of two species, Oligotrophus oleariae (Maskell) and Dryomia shawiae Anderson, have been studied in detail by Miss Anderson (2, 3). They are both endemic species. Naturally the host-plants or prey of the economic species are known. In addition, Stephodiplosis nothofagi Barnes forms budgalls on Nothofagus cliffortioides. The remaining twenty-five species are known only from captured midges and were all described by Marshall (24). It is highly desirable that the gall-midge fauna of New Zealand receive further attention in the future, both from the distributional and economic points of view. The arrangement of the list is in systematic order. In this list each specific name is followed by the name of the author, in brackets if the species was placed by him in a genus other than that to which it is now assigned. The first citation following the author's name