Table 3. The sex ratio of mixed broods in C. floridanum collected in the field in Japan.

Year	No. Broods	Average male ratio	Ranges of male ratio (max-min)
2003	20	0.031	0.049−0.008
2004	21	0.027	0.056−0.007
2005	26	0.057	0.132−0.002
2007	25	0.036	0.076−0.005

In each brood, 1000 adults are sexed. One-tailed binomial tests indicate that male ratios are significantly lower in each year at p = 0.00000.