78 THE ESSEX NATURALIST Fitter, R. S. R. (1939). The Distribution of the Grey Squirrel in the London Area. Lond. Nat. for 1938: 6-19. Fordham, W. H. (1956). Advance of grey squirrels (Sciurus carolinensis) and incidence of melanism in north Hertfordshire. Proc. zool. Soc. Lond. 126: 170-172. Johnston, F. J. (1938). The Grey Squirrel in Epping Forest. Lond. Nat. for 1937: 94-99. Laver, H. (1898). The Mammals, Reptiles and Fishes of Essex. Essex Field Club Special Memoirs vol. 3: 138pp. Lloyd, H. G. (1962). The distribution of squirrels in England and Wales, 1959. J. Anim. Ecol. 31: 157-165. Middleton, A. D. (1930). The Ecology of the American Grey Squirrel (Sciurus carolinensis Gmelin) in the British Isles. Proc. zool. Soc. Lond. 1930: 809-843. Middleton, A. D. (1931a). The Grey Squirrel. London, Sidgwick & Jackson: 107pp. Middleton, A. D. (1931b). The grey squirrel in the British Isles. J. Min. Ag. 37(11): 1069-1078. Middleton, A. D. (1932). The grey squirrel (Sciurus carolinensis) in the British Isles, 1930-1932. J. Anim. Ecol. 1: 166-167. Middleton, A. D. (1935). The distribution of the grey squirrel (Sciurus caroli- nensis) in Great Britain in 1935. J. Anim. Ecol. 4: 274-276. Parsons, B. T., and Middleton, A. D. (1937). The distribution of the grey squirrel (Sciurus carolinensis) in Great Britain in 1937. J. Anim. Ecol. 6: 286-290. Shorten, M. (1946). A survey of the distribution of the American grey squirrel (Sciurus carolinensis) and the British red squirrel (S. vulgaris leucourus) in England and Wales in 1944-5. J. Anim. Ecol. 15: 82-92. Shorten, M. (1953). Notes on the distribution of the grey squirrel (Sciurus carolinensis) and the red squirrel (Sciurus vulgaris leucourus) in England and Wales from 1945 to 1952. J. Anim. Ecol. 22: 134-140. Shorten, M. (1954). Squirrels. London, Collins: 212pp. Shorten, M. (1957). Squirrels in England, Wales and Scotland, 1955. J. Anim, Ecol. 26:287-294. Shorten, M. (1962). Squirrels—Their Biology and Control. London, HMSO Bulletin No. 184: 44pp. Stubbs, F. J. (1914). The Decrease of the Squirrel. Zoologist, Fourth series, 18: 236-237. Stubbs, F. J. (1923). Remarks on the Squirrels of Epping Forest. Essex Nat. 20(4): 205. Watt, H. B. (1923). On The American Grey Squirrel (Sciurus carolinensis) in the British Isles. Essex Nat. 20(4): 189-204. Wheeler, A. C. (1958). Squirrels in Essex. Essex Countryside 7(27): 28-29. White, G. (1789). The Natural History and Antiquities of Selbourne, in the County of Southampton. London. (Letter XXVI, dated 8.12.1769.)