The antennae are important sensory structures used to detect air movement and odors.
Among the olfactory receptors are sensilla located in several pits which lie ventrally on the basal one-third of the third segment of the antenna.
The antenna is three-segmented with a branched arista projecting dorsally from the third segment.
A U-shaped groove around the lateral and dorsal part of the depression housing the pair of antennae is the frontal lunule (the suture through which the ptilinum was everted as the fly emerged from the puparium).
| 
