Abstract: From 1978 to 1980, we investigated ecology of Mongolian steppe lemm-ing(Lagurus przewalskii)on the semidesert in Shizhiwang Qi (county), Inner Mongolia.By dissecting 1283 specimens end difsing a lot of beles, we have obtained the following results:1. The best habitat for this lemming is the depression or brush on the dunes in dried river bed.2. The steppe lemmings were fed on fresh grass and seeds. The storage chambers would reach three in number and we once discovered 3650 grams of grass in a single chamber.3. We observed ten holes of this animal,finding that the structure of the hole was rather complicated.There were in each hole three to seven openings,many tunnels,one to three nests,one to three storage chambers,one to three enlarged chambers,which are supposed to be their resting place.4. The breeding season is from the middle of March to September,the most vigorous reproduction time is from April to May and July. The annual average pregnant rate is 51.36%.The number per litter is 3-11. The average number of the embryos is 6.44,and varies with the different age of animals.

摘要： 蒙古黄兔尾鼠(Lagurus przewalskii Buechner)是内蒙古和青海等省(区)荒漠草原的代表鼠种,因破坏草原和传播某些动物流行病而被列为重要害鼠之一。迄今为止,国内有关该鼠的生态研究尚无报道,为此,我们在1978年9月至1980年5月于内蒙古四子王旗北部的荒漠草原进行了蒙古黄兔尾鼠的生态学调查。现就观察结果总结如下。