Dr. Murai Éva szerk.: Parasitologia Hungarica 22. (Budapest, 1989)

Diagram 5. Computer simulation results: number of "host changes" on 20 cattle per hour (one host change = one flying up and one settling); a summary of 100 independent simulations Count Midpoint 3 5 5 485 1 55 510 0 55 535 e 55 560 3 55 585 it 55 610 11 55 635 7 55 660 1 6 55 685 1 I 5 5 710 1 1 5 5 735 9 55 760 4 5 5 785 1 55 810 3 5 5 835 0 5 5 860 3 55 885 ,1.... + ....1.... + ....

I. 4 8 12 Histogram Frequency . I 2 0 (mean 55.683; Std err 0.008; median 55.682; mode 55.676; Std dev 0.084; variance 0.007; kurtosis 0.203; S E kurt 0.478; skewness 0.054; SE skew 0.241; range 0.414; minimum 55.478; maximum 55.892; sum 5568.265) Diagram 6. Computer simulation results: number of face fly visits (mean and range on the eyes of cattle/visit/head/hour) ! ! iiiliïÏÏ'ili ! ' ji IiiPÏi ! ' iiîîlitiîlïïtîîtilrîftîin ! i <". • i ; . • TÏ r 11

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1 ! 1 ! T ! i îîl;i , 1 IIS1I i i ^j, 1 . • _ . 1. : i , ! 11 i Successive independent simulations (1st to 100th) Upper row: short visits (- 9.9 seconds); middle row: medium long visits (10 seconds59.9 seconds); lower row: long stay visits (over 60 seconds). Each point refers to one discrete situation of a fly visit in the herd of 20 cattle.