中文摘要：

2001年7月1日至8月31日，应用焦点动物观察法和全事件行为记录法对广西南宁动物园灵长类繁殖中心的一群黑叶猴的相互理毛行为进行了分析，从中探讨其在黑叶猴社群中的功能。在27d的观察中（有效观察时间162h），共收集了663次相互理毛行为回合的数据。结果表明，相互理毛行为主要集中在无法进行自我理毛的部位，易于进行自我理毛的部位得到相对较少的相互理毛，这与卫生假说相一致。研究表明：相互理毛行为主要由理毛者发起和结束。在不同的性别年龄组中，相互理毛行为主要发生在成年雌性个体之间。虽然相互理毛行为受到社会等级的影响，但等级序位最高的个体并非最具吸引力的理毛伙伴，发生在等级序位低的个体间的相互理毛行为明显多于发生在它们与序位高的个体间的理毛行为。

英文摘要：

We studied allogrooming in a group of captive Francois langur （ Trachypithecus francoisi） at the Primate Reproductive Center, Nanning Zoo, Guangxi, between July 1 and August 31. We used focal animal sampling and all occurrence recording, recording 663 allogrooming bouts in 27 days of observations （ 162 hours of observations）. Allogrooming was concentrated primarily on body surface areas that were inaccessible during autogrooming. Areas that were easy to reach were allogroomed less frequently, supporting the hygienic functional hypothesis. Allogrooming bout initiations and terminations were decided by groomers. Allogrooming occurred more frequently between adult females. Allogrooming was influenced by social ranking, but the highest-ranking individuals were not the most attractive gromming partners. Reciprocal allogrooming bouts among low-ranking individuals were more frequent than those between high-ranking individuals and low rank individuals.