. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 592 H. FREDERIK NIJHOUT Young adult males of Acdcs aegypti, whose antennal hairs have not yet erected, do not respond to the female flight sound. This suggests that males are incapable of hearing the females when their antennal hairs are recumbent on the shaft of the antenna (Roth, 1948; Wishart and Riordan, 1959). It is therefore reasonable to assume that males of those species which show a daily rhythm of antennal hair erection are not capable of detecting females (and thus incapable of mating) during the daytime when thei
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 592 H. FREDERIK NIJHOUT Young adult males of Acdcs aegypti, whose antennal hairs have not yet erected, do not respond to the female flight sound. This suggests that males are incapable of hearing the females when their antennal hairs are recumbent on the shaft of the antenna (Roth, 1948; Wishart and Riordan, 1959). It is therefore reasonable to assume that males of those species which show a daily rhythm of antennal hair erection are not capable of detecting females (and thus incapable of mating) during the daytime when their antennal hairs are recumbent. The present paper deals with the control of the mechanism that induces antennal hair erection in ^-Inopheles Stephens! and demonstrates that antennal hair erection is under direct nervous control, disproving the common notion (, Downes, 1969) that changes in blood pressure are the causative event. MATERIALS AND METHODS Mosquitoes were reared in a temperature-controlled insectary at 27° C under a 16L:8D photoperiod regime. Adults had continuous access to a dilute sugar solution. All experiments were performed on 4-9 day old males at a room tem- perature of 23-25° C during a six hour period in the middle of the light phase of the photoperiod. The saline used in these experiments was that of Lum (1961) adjusted to pH All drugs were purchases from SIGMA Chemical Co. with the exception of Phentolamine (gift from Ciba-Geigy Corp.), Terbutaline (gift from Astra Pharmaceutical Products, Inc.). and Salbutamol (gift from Schering Corp.). Experiments on intact males were performed with the animals restrained on their backs on a glass slide covered with a thin layer of petroleum jelly. Injections were done via a glass capillary drawn to a fine tip on a micropipette puller. About /A of the experimental solution was injected into the thorax of each male. Isolated antennae were prepared by grasping the male's proboscis with forceps and cutt
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
