Fig. 2. Characterisation of trichoid hairs on the wings. (A) Two sections of a continuous recording from a basiconic sensillum on the dorsal surface of a forewing. One afferent responded with an 800 ms burst of spikes after the electrode was first placed over the intact tip of the sensillum (upper trace). After the afferent fell silent, a brief movement of the sensillum (horizontal bar) elicited a burst of spikes in a second afferent that had larger amplitude spikes (lower trace). (B) The afferent of a long hair on the postcubitus vein of the upper surface of a forewing responded with a burst of spikes to a brief movement of the hair (bar). The recording was made from the cut shaft. (C,D,F) Recordings from the cut shafts of medium length hairs on the ventral surface of a forewing (C), dorsal surface of a hindwing (D) and ventral surface of a hindwing (F). In all cases, movement (bars) elicited a burst of spikes in a single afferent. (E) Two sections of a continuous recording from a basiconic sensillum on the ventral surface of a hindwing. One afferent responded with a 600 ms burst of spikes after the electrode was first placed over the intact tip of the sensillum (upper trace). After the afferent fell silent, a brief movement of the sensillum (horizontal bar) elicited a burst of spikes in a second afferent that had a different waveform (lower trace). Basiconic sensilla were not seen on the ventral surface of the forewings or dorsal surface of the hindwings.