The mating behavior and characteristics of Monochamus alternatus adults in cages were observed over a 24 h period. Results showed that the mating behavior consisted of two steps: 1) the female got close to and moved around the male, and 2) the male caught the female and mated. Mating behavior rhythm within 24 h consisted of two mating peaks at 10:00-14:00 and 18:00-24:00. Little to no mating behavior occurred outside of these periods. Mating behavior revealed that multiple mating existed universally. Individuals with a mating frequency of 2 times (or more) accounted for 77.5% of all experimental insects, and mating lasted 50 s each time. Apart from the normal male-female mating, male-male "mating" and female-female "mating" occurred. In addition, two males sometimes fought for the right of mating with the same female.%在室内养虫笼观察并分析松墨天牛 Monochamus alternatus 在以24 h为周期内的交配行为及其规律.松墨天牛交配行为包括2个步骤:一是雌虫接近雄虫,在其周围活动；二是雄虫抱握雌虫,发生交配行为.交配日节律观察结果显示:松墨天牛在24 h内有2次交配高峰期,10:00-14:00和18:00-24:00,它在这2个时间段以外很少或几乎不交配.松墨天牛交配行为具有以下特点:普遍存在与同一个体或不同个体的多次交配现象,交配次数为2次(含)以上的松墨天牛个体约占全部个体的77.5％,每次交配时间平均为50 s；除正常雄雌交配外,还会出现雄雄和雌雌“交配”以及2只雄虫争夺雌虫交配权的现象.
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