الفهرس 
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Abstract
1- Two light traps of the Robinson type each fitted with
a mercury vapour 125 watt bulb were operated simultaneously (at
two levels 1.5 and 18.5 meters in Kena) from sunset to sunrise,
once every three nights, for two consecutive years(June 1982-
May 1984). The first trap was set up in the garden of Assiut University at Kena with its mouth at a height of 1.5 meter from ground level. The second trap was mounted on the roof of the
Botany Department, with the mouth of the trap at a height of 18.5 meter from the ground level. The fields of Kena Secondary Agriicultural School were located about 200 meters away from the traps. Eighty-three species and fourteen genera were identified, sexed
and counted. The most abundant species was Empoa~ca dec~p~en~
of which over 53,000 and 6,000 individuals were collected at 1.5
and 18.5 meters respectivelY, this species formed over 33% of the total catch at 1.5 meter, and 14% at 18.5 meter. The next commonest species was Campy~omma n~co~a~~ of which over 12,000 and 18,000 individuals were trapped at 1.5 and 18.5 meters respectivelY, this species formed over 7.9% and 42.9% of the total catch at 1.5 and 18.5 meters respectively. On the other hand, there were five species each of which only was represented by one individual throu-
the whole trapping periods.
2- The catches as a whole showed that 62 species and 11 genera preferred the flight with larger numbers at the low level, 8 and 2 genera with larger numbers at the high level, 7
and one genera only were captured at the low level, 4 species only at the high level and 2 species with equal numbers.