48 



WOKTH AMERICAN FAUNA. 



[No. 36. 



Slcull. — Very similar to that of tenuis, but braincase averaging 

 slightly larger. 



Measurements. — Average of 8 adults from Rio Grande Valley 

 (Matamoras and Camargo, Tamaulipas) : Total length, 169 (160-181); 

 tail vertebra, 98 (88-103); hind foot, 20.8 (20-21.5). Skull: (See 

 table, p. 81). 



Remarks. — This subspecies is most nearly related to tenuis, than 

 which it has a much less extensive range. The differences between 

 intermedins and tenuis are really very slight, consisting in a more 

 intense suffusion of ochraceous-buff in tenuis, especially noticeable on 

 the sides. Specimens from Bexar and Kerr Counties — the type region 

 of ^'laceyi'^ — average slightly grayer and less ochraceous than speci- 

 mens from the mouth of the Rio Grande, but individuals in each 

 series may be matched by those from the other and the differences 

 seem too slight to warrant recognition of the form. If both inter- 

 medins and "laceyi" were to be recognized, the former would be 

 nothing more than a series of intermediates between tenuis on the 

 one side and '^laceyi^' on the other. 



Specimens examined, — Total number, 65, from the following locali- 

 ties: 



Oklahoma: Mount Scott, 9. 



Texas: Brownsville, 26; Corpus Christi, 2; Del Rio, 2; Lacey's Ranch, near 

 Kerrville, 4; Padre Island, 1; Rio Grande City, 1; San Antonio, 3; San 

 Diego, 5; Santa Tomas, 2. 



Tamaulipas: Camargo, 4; Matamoros, 6. 



REITHRODONTOMYS FULVESCENS AURANTIUS Allen. 

 Golden Harvest Mouse. 



Reithrodontomysmexicanusaurantius Allen, Bull. Am. Mus. Nat. Hist,, VII, 1895, p. 137. 

 Reithrodontomys chrysotis Elliot, Field Columb. Mus., Zool. Ser., I, 1899, p. 281 



(Dougherty, Okla.). 

 Beithrodontomys aurantius Bailey, N. Am. Fauna No. 25, 1905, p. 105. 



Type locality. — Lafayette, La. 



Distribution. — Louisiana (west of the Mississippi River), southern 

 and east-central Arkansas, eastern Texas, and eastern Oklahoma; 

 north to southwestern Missouri (Carthage). Confined to Lower 

 Austral Zone. 



Characters. — Colors decidedly richer and darker than in interme- 

 dins; skull slightly larger. 



Color. — Adults in unworn pelage: Upperparts varying from pinkish 

 cinnamon to ochraceous- tawny, usually heavily mixed with blackish 

 brown; sides of head and body usually rich ochraceous or tawny but 

 without a pronounced lateral line where the. color of the sides meets 

 that of the underparts; dark markings of back frequently forming a 



