The effect of morphine hydrochloride on the larvae of Parasarcophagacrassipalpi and its forensic significance under constant temperature
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Key Words： forensic toxicologic entomology，Parasarcophaga crassipalpi，morphine hydrochloride，postmortem interval( PMI)，larval mouth hook，larval pharyngeal sclerite，sclerotized area，average optical density
Abstract： We studied the growth and development of Parasarcophaga crassipalpi ( Macquart) and the changes to the cephalopharyngeal skeleton of its larvae under the influence of morphine hydrochloride.Weaccumulated a large amount ofdata on forensic toxicological entomology from Shijiazhuang city to provide some reference for inferring the postmorteminterval ( PMI) after the death of the larvae of P． crassipalpi． We show that the sclerotized area and the average optical density of the larval mouth hook and thelarvalpharyngealsclerite keep increasing with time until the end of the thirdinstar． These characters proved to be accurate indices of PMI．