The goat warble fly, Przhevalskiana silenus (Brauer) in north Sinai, Egypt.

During monthly visits to North Sinai, a total of 43 living goats out of 2040 (2.11%) were found infested with Przhevalskiana silenus (Brauer). This was mainly in Winter. Besides, nodule caused of P. silenus larvae were recovered from 32 out of 98 (32.65%) slaughtered goats in Al Arish abattoir mainly in Summer. The overall infestation rate among slaughtered goats was 11.68 percent. On the other hand, adult flies were collected by baited traps from Bir Al Abd and Al Hasanah in late Spring and early Summer. It is concluded that myiasis is a real economic problem which affects the livestock.