Oestrus ovis, or Gadfly of the sheep

A few notes on the introduction of what I am led to believe to be a new grub or fly to Tasmania, may be of some use to the Fellows of the Royal Society. The above insect, I find, is not of any recent date, but is spoken of by a learned physician, Alexander Trallien, in the year 560. They are well-known in Europe, and have been met with at times in the Australian colonies.
On examination, and referring to some works on the disease of sheep, I find it to be the Oestrus ovis, or Gadfly of the sheep, belonging to the Diptera order, so named from its larvae inhabiting the nostrils or frontal sinuses of sheep in particular, The larvae or grub is composed of 10 or 11 rings; when young it is perfectly white, with the exception of two small brown patches by the side of each other at its tail. At some time between the middle of July these larvae have attained their full growth and seek to escape from their prison. While this is taking place great annoyance is caused to the sheep, continually stamping their feet and sneezing violently.