JU MEGADONTOMYS. NYCTOMYS. 



blackish; hands and feet white; tail above dusky, almost black, 

 beneath paler. 



Mcafiirt-mcnts. Total length, 350; tail vertebra?, 188; hind foot, 

 Skull: oceipito-nusal length, 65; Hensel, 54; zygomatic width, 

 32; interorlntal constriction, q; length of nasals, 26; palatal length, 

 33.5 ; length of upper tooth row, 1 1. 



190. nelsoni (I\-rowyscus), Merr., Proc. Biol. Soc. Wash., xn, it 



p. 116. 

 NELSON'S FIELD MOUSE. 



Type locality. Jico, State of Vera Cruz, Mexico. Altitude, 

 6.000 feet. 



(rcogr. Distr. State of Vera Cruz, Mexico; range unknown. 



(icnl. Char. Similar to M. thomasi, but darker. 



Color. Above and sides grayish brown, darkest on dorsal region; 

 under parts white: tail dusky; hands white; hind feet dusky. 



Measurements. Total length, 302; tail vertebrae, 172; hind foot, 

 35- 



191. flavidus (Mcgadontomys), Bangs, Bull. Mus. Comp. Zool., 



XXXIX. IQ02, p. 2-. 



BOQUETE MOUSE. 



Type locality. Boquete, Chiriqui, Panama. Altitude, 4,000 

 feet. 



(rcnl. Char. Braincase rounded and elevated; palatal slits very 

 wide; audital bullse small; ears small. 



Color. Above brownish cinnamon, inclined to rusty on the rump; 

 sides orange buff; black patch at base of whiskers; under parts white; 

 pectoral collar buffy; hands and feet whitish; tail above dusky, 

 beneath grayish: ears dusky inside, silvery outside. 



Mtasmnmtmls, Total length, 320375: tail vertebrae, 155-205; 

 hind foot, 31-33; ear, 2024. Skull: basal length, 35.4; occipito- 

 nasal length, 40.2; zygomatic width, iq.6; mastoid width. 15; length 

 of nasals, 17.8; width of nasals. 4.8: length of palatal slits. 7.4; width 

 of palatal slits, 3.4; length of palate to palatal notch. 17; to end of 

 pterygoid. 24.4: length of upper molar series. 5.6; length of single 

 half mandible. 21.8. (Bangs, 1. c.) 



44. Nyctomys. Vesper Rat*. 



Nyctomys Sauss., Rev. Mag. Zool.. 2me Ser., 1860, p. 106. Type 



Hespcromys sumichrasti Saussure. 

 Myoxamys Tomes, Proc. Zool. Soc., 1861. p. 284, pi. xxxi. 



