Merrianx. — New Pocket Mice from Mexico. 49 



(7(9for.— Upperparts dark brown, blackish on saddle, with only very 

 slight grizzling of fulvous; lateral line narrow or indistinct; under- 

 parts and feet white; nose and ankles dusky; tail dusky above, whitish 

 beneath except near tip which is dark all round. 



Cranial characters. — Skull very broad, much more massive than in 

 pictus series; nasals slightly emarginate posteriorly, rather broad, their 

 sides parallel on posterior half, then suddenly expanding; zygomata 

 heavy and muclt. more widely and squarely spreading than in any other 

 species; interorbital region and base of rostrum flat; interparietal nearly 

 oval; rostrum rather short, with parallel sides; superciliary beads more 

 strongly developed than usual, and reaching back to middle of parietals. 



Measurements. — Type specimen: total length 225; tail vertebrae 109; 

 hind foot 29. 



Liomys crispus sp. nov. 



Type from Tonala, Chiapas, Mexico. No. 75,105 $ ad., U. S. Na- 

 tional Museum, Biological Survey Collection. Collected August 7, 1895 

 by E. W. Nelson and E. A. Goldman. Original No. 8283. 



Characters. — Appearance strikingly different from all known members 

 of the genus; size small; tail decidedly shorter than head and body and 

 scantily haired, the scales evident; hind foot with 6 pads; color gray, 

 sprinkled with hoary hairs icith recurved tips. 



Color. — Upperparts gray, darkest along middle of back and every- 

 where sprinkled with slender whitish-tipped hairs which stand out or 

 have the tips recurved, giving the animal a unique appearance; under- 

 parts and feet whitish; no trace of lateral line; ears not edged with 

 whitish; tail pale dusky, palest (sometimes whitish) beneath but with- 

 out line of demarcation. 



Cranial characters.—Sk\i\\ mouse-like, with exceedingly faint supra- 

 orbital beads, large roughly oval interparietal, rather broad nasals with 

 parallel sides, squarely truncate behind on same plane with premaxillae. 



Measurements. — Type specimen: total length 210; tail vertebrae [ex- 

 treme tip gone] 99; hind foot 27.5. 



Liomys crispus setosus subsp. nov. 



Type from Huehuetan, Chiapas, Mexico. No. 77,588 9 old., U. S. 

 National Museum, Biological Survey Collection. Collected February 22, 

 1896 by E. W. Nelson and E. A. Goldman. Original No. 9364. 



Characters. — Similar to crispus but pelage much coarser and more 

 hispid; color darker; recurved pale-tipped hairs less abundant; tail 

 averaging longer; skull larger and more massive; supraorbital beads 

 more strongly developed; nasals more cuneate (sides less parallel), less 

 squarely truncate posteriorly, and ending anterior to premaxillae. May 

 prove a distinct species. 



Measurements. — Type specimen: total length 225; tail vertebrae 110; 

 hind foot 29. 



