﻿82 



NORTH AMERICAN FAUNA. 



[No. 10. 



General remarks.— The discovery in Colorado of a representative of 

 the tiny California Sorex tenellus is as interesting as it was unexj^ecled. 

 True tenellus inhabits the mountains of Owens Valley and the White 

 Mountains on the border between California and Nevada. The closely 

 related form here described as nanus was collected at Estes Park, 

 Colorado, by Mr. E. A. Preble. 



Specimens examined. — Total number, 4, from the following localities: 



Colorado: Estes Park (type locality), 2; West Cliff (Custer County), 1. 

 Montana: Fort Custer, 1. 



SOREX MACRODON sp. nov. 



(PI. YII, figs. 2, 2a; PL XII, figs. 12, 13.) 



Type from Orizaba, Vera Cruz, Mexico (altitude, 4,200 feet). Type, No. 58272, $ yg. 

 ad., U. S. Nat. Mus., Department of Agriculture collection. Collected January 26, 

 1894, by E. W. Nelson and E. A. Goldman. Original number^ 5759. 



General characters. — Size rather large ; ears large; tail long; colora- 

 tion dusky. Almost indistinguishable externally from 8. caudatus, but 

 with skull and teeth much larger and more massive. 



Color. — Upper parts finely mixed sepia and black, the black usually 

 predominating, particularly on the posterior half of the back; under 

 parts seal brown ; tail blackish above, j^aler beneath, without line of 

 demarcation ; feet blackish. 



Cranial and dental characters. — Skulllarge and heavy (20 by 9.5 mm.) 

 with large brain case; rostrum high; anterior nares rc^markably large, 

 and with thickened borders; palate and interpterygoid fossa broad. 

 Third uiiicuspid small, hardly half as large as fourth. Molariform 

 teeth very large and massive. 



Measurements.— TyY)e specimen : Total length, 128 mm. ; tail vertebrae, 

 52 mm. ; hind foot, 15.5 mm. Average of 5 specimens from type locality : 

 Total length, 125 mm.; tail vertebrie, 50.2 mm.; hind foot, 15.3 mm. 



General remarks.— Sor ex macrodon. while hardly distinguishable ex- 

 ternally from ^S'. caudatus, may be told at a glance by the heavy skull 

 and teeth. The skull suggests that of Blarina, particularly in the large 

 size and thickened borders of the anterior nares. 



Specimens examined. — Total number, 10, from the following localities 

 in southern Mexico: 



State of Vera Cruz: Orizaba (type locality), 5; Jico, 3. 

 State of Oaxaca: Totontepec, 2. 



SOEEX YER^PACIS Alston. 



Sorex vercB-pacis Alston, Proc. Zool. Soc. London, 1877, 44.5-446; Biologia Centrali- 



Americana, p. 55, PI, col. Y, fig. 1, 1880. 

 Sorex pacijiciis Dobson, Monog. Insectivora, Part III, PI. XXIII, fig. 8 (not S. pacificus 



Baird). 



Type locality. — Coban, Guatemala. 



General characters. — Size rather large; tail long; color very dark; 

 third unicuspid smaller than fourth. ^ 



Color. — "Nearly uniform dark dusky brown, hardly lighter beneath; 

 feet and tail dusky." 



