Table 1.

Association between mating success and head width in tests of reciprocal hybrid males

Male genotype	Number tested	Mating success, %	Head width, mm
D. heteroneura	78	50	2.81  ±  0.01
HS hybrid	79	42	2.5  ±  0.01
SH hybrid	75	56	1.98  ±  0.02

The mating successes of the different groups did not differ significantly (homogeneity χ² = 3.21, df = 2, P > 0.1).