Ezzat, Y.M. 1959a Trionymus williamsi, a new species of grass-infesting mealybugs from the suburbs of Cairo, Egypt.. Bulletin de la Société Entomologique d'Egypte 43: 405-408.
Ezzat, Y.M. 1959a Trionymus williamsi, a new species of grass-infesting mealybugs from the suburbs of Cairo, Egypt.. Bulletin de la Société Entomologique d'Egypte 43: 405-408.