Fig. 1.

(A) Photograph of the crane fly Holorusia hespera. Black pointers indicate the tips of the large halteres. (Scale bar: ∼5 mm.) (B) Scanning electron micrograph of halteres of Tipula showing fields of campaniform sensilla and their approximate orientation [according to Fox and Daniel (10)]. (Scale bar: 10 μm.) (C) Haltere primary afferent responses to stimuli are highly repeatable with low jitter. Stimulus (Top), spike response (Middle), and raster plot (Bottom) of a haltere primary afferent neuron’s response to repeated presentations of the same segment of white noise.