2、chaetia sensilla Sensilla chaetica were straight,wide at the base,and blunt (rounded)at the distal end and arose from a distinctive round collar--like socket(自状窝) Sensilla chaetica present on each fagellar segment in both sexes,angle to the antennal surface is larger than S. trichodea about 60'-90'.2、chaetia sensilla ▪ Sensilla chaetica were straight, wide at the base, and blunt (rounded) at the distal end and arose from a distinctive round collar-like socket (臼状窝). ▪ Sensilla chaetica present on each fagellar segment in both sexes，angle to the antennal surface is larger than S. trichodea ，about 60′-90′