T.  Warwick, ?Notes on the mammals of Barra, Mingulay and Berneray, Outer Hebrides?, Scottish Nat., vol. (1938), pp. 57?59, 1938.

A.  McCullough, Wakeham-Dawson, A., and Parker, M. J., ?A provisional checklist of the hoverflies (Diptera, Syrphidae) of the islands of North Uist, South Uist, Benbecula, Eriskay and Berneray in the Outer Hebrides?, Dipterists Dig. (2nd Ser.), vol. 9, pp. 95?102, 2002.