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 



