Dr. Steinmann Henrik szerk.: Folia Entomologica Hungarica 22/1-11. (Budapest, 1969)

Table No.

3. Proportion of the flight groups Plight group Proportion in percentages in county Plight group Pest Szolnok Hai du Békés short flying summer species 44,40 53,00 23,80 29,45 medium flight species 2,17 3,75 3,50 4,10 bivoltine long flight species 38,44 40,00 56,12 57,45 continuously breeding long flight species 13,99 3,25 16,58 9,00 Table No.

4. 2 Number of wild bees flying into the 1 m plots on the border and in the middle of the lucerne fields respectively, recorded between 9 and 17 o'clock Spot under review Tótkomlós 10.8.67. Érd 4.8.67. c— « O GO H « Tarhos 14.8.67. KartaJ 1.8.67. 1 m • tu Ü co X F-i 1 ai ms M m F-i • cö « CO £ m • -H <U LT\ FQ FH C\J Kismarja 31.8.67. On the border 204 67 67 36 33 24 21 20 In the middle 174 29 15 34 26 15 13 13 The data of Table No.

4. show that the number of wild bees is actually higher on the border, but the predominance is smaller than expected. In the lucerne several short flight bees, nesting in the lucerne field, are busy the distribution of which during our observations was somewhat more uniform, while that of the animals nesting elsewhere is somewhat less uniform. The latter animals are present in lesser quantity in the middle of the field than on the border of same. According to our observations the so called „

border-effect" refers to the outer, few meter wide stripe of the fields only.