MONOAMINES IN THE NERVOUS SYSTEM OF THE QUEENSLAND FRUIT FLY, DACUS TRYONI

The distribution of monoamines in the nervous system of Dacus tryoni has been investigated by two fluorescent histological techniques. The trihydroxyindole method revealed fluorescent regions in the protocerebrum and tracts in the ventral nerve cord running through to the abdomen. The ovarian and spermathecal nerves were fluorescent, as was the stomatogastric nervous system, with the exception of the frontal ganglion. The tetrahydroisoquinoline method suggested that a secondary amine was the source. Fluorescence was greatly diminished in reserpine‐fed flies. Uptake of noradrenaline into the same areas listed above was demonstrated by the tetrahydroisoquinoline method in sections of reserpine‐fed flies.