ORTHOGEOMYS HETEROOEOMYS M ACKOG KOMYS. 75 



Platygeomys tylorhinus jSlerriain. Biological Surve}' cGllec'tion. 



Nt.i-th Aincr. l\iuiia. X<>. S, pp. 1(14, KiT-KiS, pi. 18, fig. 1, January :>1, 1S95. 



.Mss;;. Skill :iii<l skull. Adult inulo. Tula, Hidulg-o, Mexico. March 



lo, 1S93. Collected 1)3' E. W. NoLsom. Orio-inal number 44^2. 



Well-made skin in gond cnntlition; skull perfect, except broken tips of 

 coronoids. 



Genus ORTHOGEOMYS 



Orthogeomys latifrons Merriaiii. 



North Anier. Fauna, No. 8, p. 17S, pi. 11, figs. 5 and fi, text fig. 64, January 81, 

 1895. 



<>1231). Skin and skull. Adult. Probal)ly from (iuatemala. From 

 World's Coliunbian Exyjosition (Chicago, 1893), Exhi})it of (iuate- 

 mala, No. 2. Catalogued November 19, 1894. 



Well-made skin in good condition, except for a little shedding of epidermis 

 about the ears. Facial ])ortion of skull, except right zygoma, complete; posterior 

 portion of brain-case cut away. Mandil)le witli both coronoid processes broken, 

 otherwise complete. 



Tyj>e designated by the original number 2. Specimen evidently not entered 

 in catalogue at time the description was written. 



Orthogeomys nelsoni Merriam. liiological Survey collection. 



North Amer. Fauna, No. 8, pp. 178, 176-178, fig. 68, January 81, 1895. 

 (Mu^>\. Skin and skull. Adult male. Mount Zemiioaltepec, Oaxaca, 

 Mexico. July s. 1891. Collected by E. W. Nelson and E. A. 

 Goldman. Original inunber (')3T6. 



Well-made skin in good condition ; skull perfect. 



Genus HETEROGEOM YS. 



Heterogeomys torridus Merriam. F)iological Survey collection. 



North Amer. I'auiia, No. 8, pp. ISO, 1S."»-I85, numerous pis. and ligs., January 

 31, 1S95. 



63629. Skin and skull. Adult female. Cbichicaxtle, Vera Cruz, 

 Mexico. February l.'), 1,S91. Collected by E. ^V. Nelson. Orig- 

 inal iiiinibcr r>S."")0. 



Well-made skin in good (•on<litioM; skull j)erfect, except for absence of left 

 upper premolar. 



Genus M ACROG EOM YS. 



Macrogeomys costaricensis Merriam. 



North Amer. Fauna, No. 8, p. 192, pi. 11, fig. .'!; pi. 18, tig. 28; pi. 14, lig. 10, 

 January 31, 1895. 



i||l]. Skin and skull. Young. l*acuare, Costa Kica. 1876. Col- 

 lected by Juan Coojier. Original number ix;. Skin catalogued 

 June 23, 1878; skull, Feliruary 1, 1887. 



Well-made skin in good condition; a little hair gone fri)m the occiput; skull in 

 good condition; except right upper incisor broken, also tips of nasals; pterygoids 

 somewhat damaged. 



