Fig. 4. (A) The effect of haemolymph collected from a fifth instar larva with a very full crop, on an ongoing FG rhythm in vitro, as seen in a frontal connective extracellular recording. (B) As in A; haemolymph collected from a non-feeding premolt fifth instar larvae. (C) As in A and B; haemolymph collected from a fifth instar larvae just after the initiation of feeding. In all panels, (i) is control; (ii) haemolymph application; (iii) wash. Scale bars, 10 s.