Bailey — North American Species of Sigmodon. Ill 



Sigmodon hispidus saturatus subsp. nov. 



Type from Teapa, Tabasco, No. 99,998, U. S. National Museum, Bio- 

 logical Survey Collection $ ad. Collected April 5, 1900, by E. W. Nel- 

 son and E. A. Goldman. Original No. 14,108. 



General cliaracters. — About the size of berlandieri but with much 

 shorter tail and richer coloration; larger and more fulvous than toUecus. 



Color. — Upperparts dark reddish brown: belly dull cinnamon brown, 

 rarely whitish; feet yellowish brown; tail black, but little lighter below. 

 Young, darker and duller colored. 



Skull. — Short and compact with heavy rostrum; molars and audital 

 bullae as in berlandieri. 



Measurements. — Average of 7 adult topotypes: total length 250; tail 

 103; hind foot 31.2. Skull oi type: basal length 29.5; nasals 12.7; zygo- 

 matic breadth 19; mastoid breadth 13.5; alveolar length of upper molar 

 series 6. 



Distribution. — Mainly in Chiapas, Tabasco, and southern Vera Cruz. 



Specimens examined. — Total number 101, from the following localities: 



Tabasco: Teapa 18, Frontera 4, Monte Cristo 2. 



Chiapas: Palenque 1, Yajalon 1, Chicharras 4, Huehuetan 7, Mts. 

 near Comitan 7, Comitan 8, Ocuilapa 2, Tenejapa 2. 



Guatemala: Zunil 2, Hda. Chancol 2, Jacaltenango 6, Nenton 7. 



Oaxaca: Tuxtepec 4, Cuicatlan 1 (im.), Mts. near Santo Domingo 3. 



Vera Cruz: Tlacotalpam 2, Otatitlan 3, Coatzacoalcos 6, Motzorongo 9. 



Remarks. — While the rich coloration is unusually marked in specimens 

 from Teapa, the type locality, considerable variation is shown through- 

 out the wide range assigned to this form. Specimens from the west 

 slope in southern Chiapas and western Guatemala are slightly larger and 

 duller colored without showing any difference to warrant separation or 

 agreeing with any other described form. In general appearance they 

 resemble S. borucae Allen, of Costa Rica, more than anything else, but 

 in cranial characters are nearer to saturatus. To the northwest the in- 

 tergradation with toltecus is shown by specimens from Motzorongo. 



Sigmodon hispidus microdot! subsp. nov. 



Type from Puerto Morelos, Yucatan, No. 108,467, U. S. National Mu- 

 seum, Biological Survey Collection, S ad. Collected March 13, 1901 

 by E. W. Nelson and E. A. Goldman. Original No. 14,581. 



General characters. — Size small; tail short; colors dark and dull; teeth 

 smaller than in any other North American Sigmodon. 



Color. — Upperparts dark, dull brown; belly grayish white or buffy; 

 tail black above, brownish black below. 



Skull. — Small, slender, and narrow posteriorly with small audital 

 bullae and very small molars. 



Measurements. — Type: total length 243; tail 96; hind foot 32. Skull 



