DIPT ERA. "''/.^v By Percy H. Grimshaw. ^"'^■'^ Introduction. In the following pages 172 species of Diptera are recorded as inhabiting the Sandwich Islands. \'er}' little was known of this section of the fauna previous to the visits of Mr Perkins — indeed I have only been able to find 22 species recorded (although I believe I have consulted all the available literature). — together with three or four referred to certain genera but not specifically identified. Of these. 10 appear to be represented in the present collection, 9 are practically cosmopolitan, while 9 were originally described from these islands. In the present contribution I have found it necessan,' to describe 106 species as new to science, and for the reception of 13 of these I have ventured to characterise 6 new genera. The collection formed by Mr Perkins being a comparatively small one, and the other published records being so few, it would be unwise to discuss at any length any peculiarity in the distribution of the species that may appear to be indicated by the few specimens obtained. I may, however, point out that out of the total number of 172 species no fewer than 134 have hitherto been obtained from only a single island. As at present known, the distribution in the various islands is as follows : In proportion to the number of species obtained, the Drosophilidae are unusually well represented, and include two new and remarkable generic forms. The Tipulidae (sensu stricto) have not yet been found on any of the islands, but their allies the F. H. III. I
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