SYSTEMATIC LIST OF THE SPECIES. 
37. ARVICOLA PENNSYLVANICUS. Wilson’s Meadow-Mouse 
38. $ Novoporacensis. The Sharp-nosed Meadow-Mouse 
39. 4, Boreatts. The Northern Meadow-Mouse ° 
40. a (GEORYCHUS) HELVOLUS. The Tawny Lemming . 
Al, aS oS TRIMUCRONATUS. Back’s Lemming 
A2, 5 Pe ’ Hupsonius. The Hudson’s Bay Lemming 
43. oe sc Grantanpicus. The Greenland Lemming 
44, Neoroma Drummonpit, The Rocky Mountain Neotoma 
Tt Mus rattus. The Black Rat : 
j- » DeEcuMaNus. The Brown Rat 
7: »» MuscuLtus. The Common Mouse 
45. ,, Leucopus. The American Field-Mouse 
46. Mertones Lasrapvorius. The Labrador Jumping-Mouse 
47, ARCTOMYS EMPETRA. ‘The Quebec Marmot 
48. > ? pruinosus. The Whistler 
20 a BRACHYuRUS. The Short-tailed Marmot . 
2% _ monax. The Wood-Chuck , 
ae “ (Spermopuitus ?) Lupovicranus. The Wistonwish . 
50. - i Parry. Parry’s Marmot 
Var. 6. ERYTHROGLUTEIA 
+> Y- PHEOGNATHA 
51. Arcromys (SPERMOPHILUS) guTTATUS? ‘The American Souslik 
57a = a Ricuarpsoni, The Tawny Marmot 
53. “3 9 Frankunir. Franklin’s Marmot 
re re oh Brercueyi. Beechey’s Marmot 
54. ifs ? » 2 Dovetasu. Douglas's Marmot 
55. 95 ae LATERALIS. Say’s Marmot 
56. » os Hoop. The Leopard Marmot , 
57. Sciurus (Tamras) Lysrerr. The Hackee , : 
58. 3 7 QuAprRivittatus. The Four-banded Pouched-Squirrel 
59. > Hupsontus. The Chickaree : ; 
53 Var. @. The Columbian Pine-Squirrel 
CO"). NIGER. The Black Squirrel 
