Abstract
Free ion concentrations in the receptor lymph of the labellar taste hair were examined on the fleshfly Boettcherisca peregrina, making use of several kinds of ion-selective microelectrodes inserted into the outer lumen of the taste hair through its cut end. The receptor lymph was rich in Na+ and Cl- but poor in K+, that is, concentrations of free Na+, K+, Ca2+ and Cl- were (in mM) 117,24,0.2 and 109, respectively. The haemolymph of this insect had similar free ion concentrations.
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