498 Mr. E. E. Austen on 



LXII. — Dipt era from, the Falkland Islands, with Descriptions 

 of a neiv Genus and Two new Species. By Ernest E. 



Austen. 



(Published by permission of the Trustees of the British Museum.) 



The Diptera described or mentioned below, with the exception 

 of two or three specimens from other sources, form part of a 

 small series of Falkland Islands insects collected and recently- 

 presented to the British Museum (Natural History) by 

 Mr. Rupert Vallentin. Although no more than four species 

 of Diptera are represented in the collection, at least two 

 appear to have been hitherto undescribed ; and of these one, 

 which also belongs to a new genus, is of special interest as 

 forming an addition to the number of species of Diptera 

 with reduced wings already known to occur in antarctic or 

 subantarctic islands. 



DolichopodidsB. 

 Genus Hydrophorus, Wahlb. 



Hydrophorus sp. incert. 



One ? , north-west corner of West Falkland, " found on 

 ponds" (indeterminable owing to condition). 



Syrphidae. 



Syrphinm. 



Genus Melanostoma, Scliin. 



Melanostoma bertrandi, sp. n. (Fig. 1.) 



$ ? . — Length, $ (4> specimens) 66 to 8*6 mm., ? 

 (2 specimens) 6 to 7 mm. ; width of head, $ 2 25 to 

 2 - 6 mm., ? just over 2 to 24 mm. ; width of front of ? at 

 vertex 08 mm. ; length of wing, <$ 5*75 to 7'5 mm., ? 5*4 

 to 6'25 mm. 



Allied to and in appearance resembling M. stegnum, Say, 

 of North and South America, but distinguishable owing to 

 lower margin of face in present species being more prominent 

 in front and to dorsum of second abdominal segment in $ being 



