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甘肃省的陇中以及陇东北的黄土高原地带，目前在部分县内仍有黑热病（内脏利什曼病）散发［１］。１９９８年，我们选择地处陇中５０年代为甘肃省黑热病的重流行区［２，３］的秦安县进行白蛉监测。在１９９８年６～８月白蛉季节内，选择于５０年代有白蛉密度观察资料的该县郭
Longzhong in Gansu Province and the Loess Plateau in Longdong, there are still some kala-azar (visceral leishmaniasis) in some counties [1]. In 1998, we chose to monitor the whiteflies in Qinan County, which was the heavy endemic area of Gansu Province for kala-azar in the 1950s. From June to August 1998, during the white catfish season, the county cat was selected to observe the density of white catfish in the 1950s