摘要
I. INTRODUCTIONThe sex-specific photoreceptors of the compound eye of the housefly are important in the visual information processing of the eye, especially that related to the chasing behaviour. In the past few years, Franceschini et al. (1981), Hardie et al. (1981), Hardie (1983) and WU Wei-guo et al. (1986) have found the sex-specific central retinula cells, R7 (subsequently designated as R7s), in the dorsal region of the compound eye of the male housefly but not in the female housefly.
