الفهرس 
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Abstract
INTROWCTION ------------
Recently, flies of the family Aleyrodidae (whiteflies)
are of importance as pests of economic crops such as; vegetables,
citrus, cucurbitaceous, cotton and ornamental plants.
Whiteflies damage to their different host plants
includes the suction of sap by larvae and adult flies,
curling and yellowing of young leaves, as well as collapse
of the infested leaves due to the accumulation of honey
dew on them. Later on, duet sticks to honey dew and fungus
grows on the infested leaves which results in a dirty
black appearance and causes indirect injury by transmission
of certain virus diseases to a lot of plants of recognized
economic importance.
Family Aleyrodidae is one of the most important families
in the. order Homoptera. It includes about 1156
species belonging to 126 genera all over the world
(Wound & Halsey, 1978).
Whiteflies are widely distributed in many regions
with diverse climatic conditions of temperature such
as subtropical, tropical and palaearctic zones.
The generic and specific classificaUon of subfamily
Aleyrodinae of the family Aleyrodidae is based
entirely on the study of the so-called pupal cases
which are the exuviae of the fourth instar larv