218 ANNALS OF SCOTTISH NATURAL HISTORY 



I may add that I remember when a pair of water-hens 

 ( Gallinula chloropus] frequented this tarn, and have seen their 

 nest there. Messrs. Scott and Lindsay speak of the minnow 

 being there. It must, surely, have been artificially intro- 

 duced. It has never come under my notice, and I have 

 known the pond for many years. 



EDINBURGH,////)' 1905. 



ON THE DIPTERA OF THE FLANNAN 



ISLANDS. 



By PERCY H. GRIMSHAW, F.E.S. 



THE following is a list of the Diptera collected by Mr. W. 

 Eagle Clarke during his sixteen days' sojourn on the 

 Flannan Islands in the month of September 1904. About 

 340 specimens were captured, and these represent something 

 like 40 distinct species. It is, to say the least, surprising to 

 find such a variety of Diptera on this small storm-swept and 

 remote group of islands, and some of the species, such as 

 the unidentified Pericoma, BlepJiaroptera modesta, Liuwsina 

 crassiuiana, and a fine unknown Spilogaster with large and 

 conspicuous spots on the abdomen, are of much interest. 

 Our knowledge of the insect life of all the outlying islands 

 round our coasts is extremely limited, and a collection such 

 as that made by Mr. Eagle Clarke, and very kindly submitted 

 to me for examination, must always be of great value to the 

 student of distribution. All the specimens have been pre- 

 sented by Mr. Eagle Clarke to the Royal Scottish Museum. 



1-2. Sciara spp. Three females, representing two distinct species 

 which I have not been able to identify. They both belong 

 to Section II. of the Monograph by Winnertz. 



3. Scatopse twtata, L. Two females. 



4. Chironomidtz. Thirty-four specimens. I have hitherto paid so 



little attention to this Family that I must reserve the 

 publication of my records until the identifications are less 

 doubtful than they are at present. 



5. Pericoma sp. One specimen. 



6. Tipula ? confusa, V. d. Wlp. Four males and two females of 



what I take to be this species. 



