64 



occurs in Dorsetshire, and apparent!}- througliout Wales, since tlic 

 Museum possesses specimens from Gl)n}bedd, Cadoxton juxta-Neath, 

 Glamorganshire, S. Wales, October nth, 1898 {^Dr. D. Thomas: on 

 cattle), and others from Beddgelert Valley, Carnarvonshire, N. Wales, 

 July, 1901 {0. Peter: also on cattle). From Dorsetshire there are speci- 

 mens from Corfe Castle, June and July 14th, 1897 iE. R. Bankes), and 

 Bonsley Down, near Blandford, September 25th, 1895 (the late /. C. 

 Ulanscl-Phyddl). In the latter neighbourhood the insect proved 

 troublesome to the army horses engaged in the Autumn Manoeuvres 

 of 1872. 



The Forest Fly occurs throughout Europe and in verj- man)- other 

 widely distant localities, to some of which, at any rate, it has doubtless 

 been carried with horses in recent years. The Museum collection 

 includes specimens of the species from, — Algeria ; the Cape of Good 

 Hope ; Madeira ; Canary Is. ; St. Michael's, Azores ; Trebizond, 

 Turkej' in Asia ; Bengal ; Upper Burma ; Celebes ; Fiji ; and New 

 Caledonia. 



Genus 

 ORNITHOMYIA, Latreille. 



Ornithomyia avicularia, Linn. 



Plate 32. 



This species, which is a bird-parasite, is, as might be expected 

 generally distributed throughout the British Islands. The localities 

 of the Museum series of specimens range from the Shetland Islands 

 to Dorset, and include S. Wales and Co. Wicklow, Ireland. The birds 

 from which the flies were obtained were as follows : — pheasant, part- 

 ridge, red grouse, blackcock, snipe, long-eared owl, barn owl, green 

 woodpecker, thrush, blackbird, wheatcar, white-throat, red-backed 

 shrike, and starling. The flics frequently occur singl)-, but sometimes 

 a male and female, or even as many as three specimens, are found on 

 the same bird. If a bird infested by one of these insects be shot, the 

 parasite will sometimes take wing and fly with great pertinacit)- 



