SYSTEMATIC LIST OF ILLUSTRATIONS. 755 



SCIURINAE. 



Sciurus cinereits, Linn. Skull, Plate XLVIII, fig. 2. 

 carolinensis, Gm. Skull, Plate XLV, fig. 2. 

 hudsonius, Pallas. Skull, Plate XLVI, fig. 1. 

 fremontii, Towns. Animal, Plate VI. 



douglassii, Bach. Details, Plate XX, fig. 1. Skull, Plate XLV, fig. 3. 

 douglassii, Bach., var. suckleyi. Animal, Plate VII. 

 Tamias striatus. Skull, Plate XLVI, fig. 2. 



quadrivittatus, Eich. Details, Plate XX, fig. 2. 

 townsendii. Skull, Plate XLV, fig. 4. 

 townsendii, Bach., var. Oooperi. Animal, Plate V, fig. 2. 



Spermopliilus beecheyi, Kich. Animal, Plate III, fig. 2. Skull, Plate XLVI, fig. 3. 

 douglassii, Rich. Skull, Plate XLV, fig. 1. 

 grammurus, Bachman. Animal, Plate IV, fig. 1. 

 lateralis, Rich. Details, Plate XX, fig. 3. Skull, Plate XLV, fig. 5. 

 harrisii, Aud. and Bach. Skull, Plate XL VIII, fig. 3. 

 franMini, Rich. Skull, Plate XLVI, fig. 4. 

 Cynomys ludovicianus. Skull and teeth, Plate XL VII, figs. 2-3. 



gunnisonii, Baird. Animal, Plate IV, fig. 2. Skull, Plate XL VII, fig; 4. 

 Arctomys monax, Gmelin. Skull, Plate XLIX, fig. 1. 



flaviventer, Bachman. Skull, Plate XL VII, fig. 1. 



CASTORINAE. 



Aplodontia leporina, Rich. Details, Plate XX, fig. 4. Skull, Plate XLIX, fig. 2. 

 Castor canadensis, Kuhl. Skull, Plate XL VIII, fig. 1. 



SACCOMYINAE. 



Geomys bursarius, Rich. Details, Plate XXII, fig. 1. Skull, Plate L, fig. 2. 

 breviceps, Baird. Skull, Plate LII, fig. 2. 

 pinetis, Rafinesque. Details, Plate XXII, fig. 3. 

 castanops, Leconte. Animal, Plate X, fig. 2. Skull, Plate L, fig. 1. 

 Mspidus, Leconte. Details, Plate XXII, fig. 4. 

 Thomomys bulbivorus. Animal, with details of external form, Plate XI: Skull, Plate L, fig. 



3, and Plate LII, fig. 1. 



laticeps, Baird. Animal, with details, Plate XII, fig. 1. 

 Thomomys borealis. Details, Plate XXII, fig. 2. 



rufescens, Maxim. Animal, Plate X, fig. 1. 

 fulvus. Animal, with details, Plate XII, fig. 2. 

 Dipodomys ordii, Woodhouse. Animal, Plate V, fig. 1. Details, Plate XXI, fig. 1. Skull 



much enlarged, Plate LI, fig. 1. Natural size, fig. 2. 

 agilis, Gambel. Animal, Plate IX, fig. 1. 



Perognathus penlcillatus, Woodhouse. Details, Plate XX, fig. 5. 

 hispidus, Baird. Skull, Plate LI, fig. 4. 



