The Effect of Some Anions and Cations upon the Fluxes and Net Uptake of Sodium in the Larva of Auedes Aegypti (l).

It is now well established that the anal papillae of culicine larvae secrete salts from the dilute external medium into the body (Koch, 1938; Ramsay, 1953; Stobbart, i960). In the case of the larvae of Aides aegypti the exchange and net transport of sodium through the papillae have been studied in some detail (Treherne, 1954; Stobbart, 1959, i960) and it appears that the sodium pump in the papillae operates in conjunction with something resembling an exchange-diffusion mechanism (Stobbart, 1959, i960). The anal papillae of this species are also the site for the exchange of phosphate between body and medium (Hassett & Jenkins, 1951). The work to be described in the present paper is an attempt to characterize more closely the mechanism for sodium transport in the larva of Aides aegypti.