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NORTH AMERICAN FAUNA. 



LNo. 10. 



and S. ricliardsoni the inner side of the cusp wears away as fast, or 

 nearly as fast, as the outer side, and this semblance to an accessory 

 cusp seldom appears. 



Measurements. — Type sjDecimen: Length, 116 mm.-, tail vertebrae, 

 44 mm.; hind foot, 12.6 mm. Six others from tyxie locality average: 

 Length, 116 mm.; tail vertebne, 45.4 mm.; hind foot, 13.2 mm. Seven 

 adults from Elizabethtown, Essex County, N. Y., average: Length, 

 119 mm.; tail vertebrae, 43.7 mm.; hind foot, 13.1 mm. 



General remarJcs. — Sorex fumeus is very dift'erent from any of the 

 other Shrews found in the eastern United States. In size it about 

 equals S. richardsoni, but is readily distinguished from the latter by the 

 absence of a well-marked dark dorsal area and by cranial and dental 

 characters. The anterior oritice of the infraorbital canal lies farther 

 back in S. fumeus^ while the unicuspid teeth are narrower and less 

 robust, as Avell as different in form. 



Overstuffed skins of Sorex personatus are superficially much like 

 S. fumeus in the dull summer coat, but there is never any difficulty in 

 determining specimens that have been measured in the flesh or that 

 are accompanied by skulls. 



SOREX LONGIROSTRIS Baclimau. 

 (PL IV, figs. 2, 3, and 4; PI. VI, fig. 9.) 



1837. Sorex longirostris Bachman, Joiir. Acad. Nat. Sci. Phila., VII, Part II, p. 270, PI. 



XXIII, fig. 2, (Swamps of Santee River, South CaroUna.) 

 1857. ?? Sorex personatus Baird, Marum. N. Am., p. 30. (Washington, D. C.) 



Type locality. — Swamps of the Santee River, South Carolina. 



Geographic distribution. — Sorex longirostris is at present known to 

 occur in Bertie County, C, and at Raleigh, N. C. 



General characters. — In size and external appearance Sorex longiros- 

 tris is very similar to S. personatus. It differs from all the Shrews of 

 the eastern United States in its broad rostrum and small fourth upper 

 incisor. 



Color. — Dorsal surface uniform sepia, faintly tinged with chestnut on 

 rump, fading to broccoli brown on the sides, and this in turn to smoke 

 gray on the belly; no lines of demarcation anywhere; fur everywhere 

 slate colored at base; dorsum of manus and pes pale Isabella color; 

 tail obscurely bicolor, sepia dorsally and at tip, dirty white ventrally. 

 The three specimens which I have before me, all taken at Raleigh, 

 N. C, in January and February, show no variation in color, except that 

 one has the belly distinctly washed with broccoli brown. 



Shull. — The skull of Sorex longirostris (PI. YI, fig. 9) is shorter than 

 that of S. personatus and has the rostrum broader as compared with the 

 brain case. The bony palate is remarkably broad and short, the rows 

 of unicuspid teeth being especially widely separated as compared with 

 S. personatus. The anterior opening of the infraorbital canal is moder- 

 ately large and subcircular in outline. The posterior border is over a 



