6 4 
occurs in Dorsetshire, and apparently throughout Wales, since the 
Museum possesses specimens from Glynybedd, 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 (E. R. Bankes), and 
Bonsley Down, near Blandford, September 25th, 1895 (the late J. C. 
Mansel-P ley dell). 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 very many 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, 
Turkey 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, wheatear, white-throat, red-backed 
shrike, and starling. The flies frequently occur singly, 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 pertinacity 
