Bruce1 (1917) has recently published a paper reporting from Vancouver Island a very interesting case of vaginal myiasis in the cow due to the "rat-tailed larva" of the drone fly, Eristalis. He does not say how many larva were found, but notes that the vagina was diseased and that a discharge was present. In his paper, Bruce says: "I am unable to find any reference to invasion of the vaginal cavity by the larvae of E. tenax in either man or animals." As a matter of fact, Bruce's case is the second recorded case of this sort, the first having been published by Hall and Muir2 (1913). Their record is as follows:
In the Bureau of Animal Industry collection of parasites . . . there are also eight Eristalis larvae sent in from Laurel, Md., in 1909, with the statement that they were passed in a jelly-like substance from the vagina