100 HETEROMYS. 



Color. Entire upperparts blackish, nearly pure black on rump, 

 with ochraceous buffy hairs scattered throughout the dark ones; 

 outer side of hind legs black; outer side of arms and flanks slaty gray, 

 the ochraceous-buff hairs interspersed; lateral line ochraceous-buff ; 

 underparts white; hands slaty gray; fingers and feet whitish; ankles 

 and third of tarsus dusky; tail above blackish, beneath whitish. Ex 

 type in United States National Museum. 



Measurements. Total length, 283; tail, 148; hind foot, 35. 

 Skull: Occipito-nasal length, 34.1; Hensel, 24.2; zygomatic width, 

 17.1; intertemporal width, 9.4; length of nasals, 14.4; width of brain- 

 case, 15.2; length of upper molar series, 5.3; length of mandible, 

 15.4; length of lower molar series, 4.6. Ex type in United States 

 National Museum. 



Heteromys australis conscius Goldman. 



Heteromys australis conscius Goldm., Smith. Misc. Coll., LX, 1913, 

 p. 8. 



Type locality. Cana, eastern Panama. Altitude 2000 feet. 



GenL Char. Similar to H. australis but darker. 



Color. Entire upperparts slaty black lined with gray; lips, inner 

 side of limbs, and underparts of body whitish; forearms white and 

 gray mixed; tail above brownish, beneath lighter; ankles dusky; 

 hands and feet grayish; fingers and toes whitish. Ex type in United 

 States National Museum. 



Measurements. Total length, 260; tail, 133; hind foot, 32. 

 Skull: Occipito-nasal length, 34.7; Hensel, 23.9; zygomatic width, 

 16.5; intertemporal width, 8.3; length of nasals, 14.4; length of upper 

 molar series, 5.4; length of mandible, 15.9; length of lower molar 

 series, 5.1. Ex type in United States National Museum. 



Heteromys crassirostris Goldman. 



Heteromys crassirostris Goldm., Smith. Misc. Coll.,LX, No. 2, 1912, 

 p. 10. 



Type locality. Near head of Rio Limon, Mount Pirri, eastern 

 Panama. Altitude 5000 feet. 



Color. Head and upperparts mixed black and ochraceous; outer 

 side of limbs dark, with a gray shade; lips, throat, and under side of 

 arms white; rest of underparts and under side of thighs yellowish; 

 hands dusky to near fingers which are white ; feet whitish ; tail brown 

 above, whitish beneath. Ex type in United States National Museum. 



Measurements. Total length, 267; tail, 132; feet, 32.5. Skull: 

 Greatest length, 34.5; Hensel, 23.4; zygomatic width, 16.3; inter- 

 temporal width, 9.3; length of nasals, 14; width of braincase in front 



