S. Mahunka szerk.: Folia Entomologica Hungarica 44/1. (Budapest, 1983)

two measurements was used as the generalized measure of the size of a mite, and its correlation with each numerical expression of other characters was calculated. Results listed in Table 5 show that great majority of measurements were significantly correlated with the size of the body in both sexes. The proportion of correlated to not correlated measurement is slightly larger in males than in females. Source of the mites (field collection or laboratory rearing) show little or no influence on this relationship. The character measurements little correlated or not correlated with body size are listed in Table 6. Table 1. Comparison of character divergence between laboratory (1) and field collected (2) populations of Tarsonemus nodosus Schaar.

x Number of characters Sex and kind of characters Ho accepted Ho rejected at 0.05 0.01 0.01 Males measurable characters 22 21 42 ratios 34 7 16 total 56 28 58 Females measurable characters 52 2 13 ratios 33 3 6 total 85 5 19 Grand total 141 33 77 X The comparison is based on the null hipothesis Ho: x

li " x

2i = 0 where x^j, x

2i = mean numerical expression of a character in either population. x

li " x

2i = 0 where x^j, Table 2. Comparison of divergence of characters (direct measurements and their ratios) in difdifferent regions of the body of Tarsonemus nodosus Schaar. Classification of characters Index

X (measurements and/or ratios females (measurements and/or ratios males females General 1.00 0.33 Lengths of setae 0.65 0.32 dorsal 0.68 0.27 ventral 1.00 0.63 on legs I—III 0.30 0.33 on legs IV 0.40 0.50 Distances on body surface 0. 57 0.11 on dorsal side 0.61 0.06 on ventral side 0.38 0.13 on legs I-III 0.44 0.14 on legs IV 0.71 0.25 No. of differences significant at 0.05 Total No. measurements and ratios