Table 3. Sex ratio (male:female) of T. eques, T. melanogaster, and T. scalaris for each population collected from Central Mexican Highlands (df = 1 for all tests).

	T. eques		T. melanogaster		T. scalaris
	Sex ratio	χ2 test (P)	Sex ratio	χ2 test (P)	Sex ratio	χ2 test (P)
Lerma	1:1	0.45 (0.49)	1:1	2.0 (0.15)	1:1.5	12.46 (0.0004)
Cuitzeo	1:2	4.33 (0.03)	1:1.4	14.9 (0.0001)
Cerrillo	1:3	6.76 (0.009)
S. Morelos					1:1.7	9.94 (0.001)
Zempoala					0:23	23.0 (<0.0001)