The Dutch Fungivoridae in the collection of the Zoological Museum at Amsterdam by Dr. G. BARENDRECHT The collection of Dutch Diptera in the Zoological Museum at Amsterdam consists for the greater part of the collection Prof. Dr. J. C. H. de M e ij e r e brought together in some forty years. Most of the material was identified by the col-lector himself, leaving, however, such famihes as the Tendi-pedidae, Simuhidae, Psychodidae, Sciaridae, and Fungivori-dae entirely or partly to a specialist or some other person who could give all his time to one group. In this way the writer, then assistant to Prof, de Meijere, some years ago under-took the determination of the fairly extensive Fungivoridae material. That at present the work on fungus gnats is so much more gratifying than twenty years ago is largely due to Land-rock's monograph in Lindner : ,,Die Fliegen der paläarkti-schen Region" and to Edwards' work on the British Fungi-voridae. Still, consulting the original literature, especially the papers of Dziedzicki, Lundstroem, Johannsen, Edwards, and Landrock, remains indispensable. For such keys and descriptions as are to be found in Land-rock's monograph, are seldom sufficient, not because their being worse than others but owing to the difficulty of giving a verbal diagnosis of these gnats. Like in so many other fa-milies of Diptera satisfactory characters for separating the species can only be obtained from the male hypopygium. We are, therefore, largely dependant on the figures of these parts and it is much to be regretted that the numerous figures of hypopygia in Landrock's monograph are, on the whole, so badly reproduced. Hence, one is often compelled to consult the original figures of Dziedzicki, Lundstroem, and Edwards. Except Prof, de Meijere's collection (including a small remnant of the collection van der Wulp) the Museum ob-tained a collection of fungus gnats reared from various species of mushrooms by Mr. and Mrs. Westenberg-Sorg-drager. This collection was also entrusted to the writer for examination. It appeared that in several cases species of Fungivoridae were reared from mushroom species in which they were not known to breed, so far as the data in Land-
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