Adult C. grisescens Head (A-O), A Head, general view B frontal sclerite, ommatidium of eye and inter-ocular space, anterior view C flagellomeres, anterior view D-F Types of antennal sensill G-M Mouthparts, anterior view H-I Labrum end part J Mandible K Maxille L Hypopharynx M Labium N Maxillary palpus O Terminal of the 3^rd maxillary palpus. ant: antenna; ce: compound eye; hy: hypopharynx; la: Labellum; lr: Labrum; li: labium; ma: maxilIe; map: maxillary palpus; md: mandible; mdt: Teeth of mandible; sba: Sensillum basiconica; sc: Sensillum campanulate; sch: Sensillum chaeticum; sco: Sensillum coeloconica; sen: Sensilla; sep: Sensory pit; str: Sensillum trichodea.