Within a few hours after birth, the larvae develop into Pupae, which are hard, dark brown in color and firmly glued to the wool.
"Common Diseases of Farm Animals"
R. A. Craig, D. V. M.
The adult parasites and the Pupae are large and easily found.
"Common Diseases of Farm Animals"
R. A. Craig, D. V. M.
In this they soon change to Pupae, from which are produced a second breed of flies by the end of June and beginning of July.
"Success With Small Fruits"
E. P. Roe