关键词: 哺乳动物, 动物区系, 动物地理区划

Abstract: There are 75 species of mammals in Ningxia H ui Autonomous Region，belonging to 6 orders．19 families and 52 genera(Table 1)．In the mammalian fauna，palaearctic elements contain 49 species，accounting for 65.33% of the total number of 75；oriental region ones are found to have 7 species，accountong for 9.33% ；the remaining 19 species make up 25.33% ，which are widely distributed．Glires are dominant in the fauna，inculding 38 species of rodents and hares，accounting for 50.67% ．Among the other 37 species of mammals，23 are rare ones，and they are being protected by the People s Governm ent. Ningxia，covering 3 subregions of 2 zoogeographical regions，can be divided into 3 zoogeographical provinces，each of them having 2 zoogeographical prefectures(Table 1，Fig.1)．
I. South Ningxia Loess Plateau Province．There are 48 species in the area，making up 64.oo% of the total number．This area belongs to Loess Plateau Subregion of North China Region， so the faunistic elements are primarily of North China Region．
Ⅰ_A. Liupanshan Mountain Prefecture．There live 35 species,of which 11 species are found in this area only．
I B. South Ningxia Loess Hill Prefecture．It has 35 species，5 of them found to Occur there only．
Ⅱ．M iddle and North Ningxia Semi-desert Hill-Plain Province．There are 40 species of mammals，accounting for 53.33% ．Although the area belongs to Eastern Steppe Subregion of Neimenggu-Xinjiang Region,the faunistic elements are complex and present the characteristics of transition from North China Region to Neimenggu-Xinjiang Region．
Ⅱ_A. M iddle Ningxia Semi-desert Hill-Prefecture.Thereare4 species of mam-males,and 4 of them can be found in this areaonly.Elements of Neimenggu-XinjiangRegion are superior in number，but not in species． Ⅱ_B．Yinchuan Plain Prefecture．There live 32 species of mammals,of which 5
species occur in the prefecture only．Specise of Neimenggu-Xinjiang Regionare littlemore than those of North China Region．
Ⅲ.othwest Ningxia Desert Province．There are 34 species of mammals，m aking45.33%.It is a part of Wsetern Desert Subregion which belongs to Neimenggu-xin-jingRegion，but elements of North China Region are superior in species．Oriental regionspecies of mam mals can not be found there．　　　　　　 Ⅲ_{A .}Helanshan Mountain Prefecture．There live 33 species of mammals．and 8 ofthem occur in the mountainous district only．It is a peculiarity in Western Desert Subregion that the species of North China Region are more than of Neiminggu-Xinjinag Region．
Ⅲ _B.Tenggeli Sandy Desert Prefecture．There are 17 species of mam mals．but onlyone of them can not be found in other prefecture．Elements of Neimenggu-Xinjiang Regionare superior in both specise and number．
Indexes of faunistic resemblance between the 3 zoogeographicaI provinces areworked out by the formula S= 2c／(a+b)：S_Ⅰ-Ⅱ = 0．50，S_Ⅰ-Ⅱ= 0.46，S_Ⅰ-Ⅱ =0．43.Those between the 6 zoogeographical prefectures are also compared (Table 2)．
The authors suggest that dividing zoogeographical province should break down boundaries between administrative provinces or autonomous regions．

Key words: Mammals, Fauna, Zoogeographical division