SIGMODON. 



ORYZOMYS. 



202. minimus. {Sigmodon), Mearns, Proc. U. S. Nat. Mus. Wash., 

 1894, p. 130. 



Type locality. Upper Corner Monument, Mexican boundary line. 

 New Mexico. 



Geogr. Distr. Southern New Mexico into Mexico. 



Genl. Char. Under fur darker than in ^. h. texensis, or S. h. 

 arizona; ears, feet and tail denseh' haired: tail not distinctly bicolor. 



Color. Above grayish mixed with blackish and light yellowish 

 brown; under parts clay buff; feet yellowish gray. Tail brownish 

 black, paler below. 



Measurements. Total length, 223; tail vertebrae, 94; hind foot, 

 28; ear, 12. 



48. Oryzomys. 



I. I=i; M. t^ = 16. 



I— i' 3-3 



Oryzomys. Baird, N. Am. Mamm. , 1857, p. 458. Type, Mus palus- 

 tris, Harlan. 



Form rat-like. Ears nearly buried in the fur. Hairs of body 

 coarse. Tail longer than head and body; the hairs longest on the 

 under surface. Hind feet very long. Soles naked, with six tuber- 

 cles, all very small except the posterior, which is very long and 

 narrow. Upper margin of the orbit raised into a compressed crest, 

 as in Sigmodon. (Baird, 1. c.) 



Fig. 32. Oryzomys aquaticus. 



No. 2683 Field Columbian Museum Coll. Nat. size. 



Lower tooth row. Upper tooth row. 



Enlarged 6 times. Enlarged 6 times. 



