25 2 Proceedings of the Royal Irish Academy: 



Cork and Kerry (" Irish Naturalist," vol. xi, pp. 74-93), in which 312 species 

 are recorded. Up to the present, something like 1050 species have been 

 recorded for Ireland as a whole, which number the present list increases 

 to 1210. Of this total number, about 43 per cent, have been discovered in 

 the district covered by the present Survey, and about 13 per cent, have not 

 been recorded beyond it. This appears to me to show a somewhat large per- 

 centage of peculiarity ; but whether this is due to insufficiency of knowledge 

 or to an actual feature in distribution it is not yet possible to say. 



My method of collecting has been to pin every specimen which fell to the 

 net, be the species common or otherwise. The detailed figures given for each 

 species and locality may therefore have a certain amount of value as indicating 

 roughly the abundance or scarcity of the species concerned. 1 But against this 

 must be set the fact that while several days were spent on Clare Island, other 

 localities show only the result of a single day's, or perhaps half a day's, 

 collecting. The area richest in Diptera seems to be the Demesne at Westport, 

 whence 148 species were obtained. This may be accounted for by its varied 

 character — woodland, marsh, sea-coast, and open ground of various kinds all 

 occurring within its limits. Belclare and Louisburgh come next, with 145 

 and 113 species respectively, while in a single forenoon at Mulranny 105 

 species were obtained. 



Eegarding the Dipterous fauna of Clare Island itself as compared with the 

 mainland, little is worthy of note. The following figures indicate the results 

 of the Survey, and are pretty much what one would expect: — 



Total number of species in the whole area investigated . 519 

 Number of species found on mainland . . . . .476 



Species found on mainland only 308 



Species common to mainland and Clare Island . . 168 

 Number of species found on Clare Island . . . 211 

 Species found on Clare Island only 43 



Of the species new to the British fauna one belongs to the Tendipedidae 

 (Chironomidae), two are Empidae, and two are Anthomyidae. They are as 

 follows : — 



Metriocnemus modestus Mg. (nee Verrall), Mydaea anceps Ztt. 



Hilara lasiopyga Lundbeck, Zimnophora nigriventris Ztt. 



Tachydromia albocapillata Fin. 



A word remains to be said as to the nomenclature used in this paper. In 

 the main I have followed the " Katalog der Palaarktischen Dipteren " of 



1 In the case of many common species of general distribution in Britain I have merely stated the 

 ocalities whence examples were obtained. 



