Sensilla chaetica
The sensilla chaetica of the adult labial palpus differ from those on the antennae, with two subtypes (SCh IV, SCh V). SCh IV is found on segments 2 and 3 of the labial palpus, while SCh V is found on segment 2 of the labial palpus. These two subtypes of inductors differ considerably in length and basal width (Table 4).
The basal width of the SCh V on the labial palpus of females was significantly wider than that of males. In contrast, the number of SCh IV (♀ = 250.00 ± 10.32, ♂ = 304.20 ± 7.69, t = -4.21, P = 0.00) on the third segment of the labial palpus was significantly greater in males than in females (Fig. 3).