SYSTEMATIC INDEX 



ORDER RODENTIA. 



FAMILY MURID^. 



Subfamily Microtince. 



PAGE 



1. Dicrostonyx, Gloger 137 



1. torquatus, Pallas 148 



la. t. torquatus, Pallas 148 



16. t. ungulatus, von Baer 149 



2. chionopses, Allen 150 



3. rubricatus, Richardson 151 



3a. r. rubricatus, Richardson 151 



36. r. richardsoni, Merriam 153 



3c. r. unalascensis, Merriam . . ... . . 154 



4. exsul, G. M. Allen 155 



5. groenlandicus, Traill 155 



6. hudsonius, Pallas 157 



7. fgulielmi, Sanford 160 



8. fhenseli, Hinton 163 



2. Synaptomys, Baird . 165 



1. cooperi, Baird 169 



2. fatuus. Bangs 169 



3. helaletes, Merriam 170 



3a. h. helaletes, Merriam 170 



36. h. gossii, Coues 171 



4. borealis, Richardson 172 



5. dalH, Merriam 173 



6. wrangeli, Merriam 174 



7. andersoni, Allen 174 



8. chapmani, Allen 175 



