30 



U. 8. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



Measurements. 



Length of palate in 3096, 0. 25 inches. 



This species bears a close resemblance to S. cooperi, with the same dental formula of 32 teeth, 

 but is even smaller in every respect ; one speciman (1685) weighs but 38^ grains. The muzzle 

 is shorter, and does not project so far beyond the incisors. The tail is appreciably shorter, but, 

 at the same time, a good deal thicker, and, like the feet, covered with larger and more lustrous 

 hairs. The hind feet are considerably shorter and broader, the heel more hairy ; the three in 

 termediate digits shorter. The ears appear smaller. 



The skull is shorter, and perhaps not quite so slender. The teeth are much more extensively 

 and deeply colored, being pitchy chestnut instead of light chestnut. The two anterior upper 

 premolars are larger ; the difference in size between them and the next two much more strongly 

 marked ; the internal lobes of the shorter anterior incisors more prominent. 



Diminutive as this species is, it is yet appreciably larger than the Sorex personatus, which it 

 otherwise resembles. The hind feet are about the same length, but with the hands, much 

 broader ; the tail, also, is larger and thicker in every way. 



List of specimens. 



SOREX PERSONATUS. 



Sorex pertonatus, GEOFF. Mem. du Mus. XV, 1828, 122. IB. Mag. de Zool. 1833 ; pi. xiv. 

 FIICBKR, Syn. 1829, 255. 



BACH. J. A. N. Sc. Ph. VIJ, 1837, 398, (from Geoff.) 

 ACD. & BACH. N. A. Quad. Ill, 1854, 314, (copied.) 

 WAGNER, Suppl. Schreb. V, 1855, 548. 

 Sorex longirostris, BACH. J. A. N. Sc. Ph. Vll, 1837, 370 ; pi. xxiii, f. 2. 



ADD. & BACH. N. A. Quad. Ill, 1853 ; pi. cl, f. 3. (Description nearly same as that of Bach.) 



Sr. CH. Size very small. Ears large, as long as the adjacent fur. Hairs on the back short, but little over a line in length. 

 Feet Blender, but moderately long ; tubercles of soles not distinct ; fore feet contained nearly twice in the hinder ones. Tail 

 but a little longer than the body, exclusive of head ; about two-thirds as long as head and body, with a brush at tip. Third 

 and fourth lateral upper teeth equal . Anterior upper incisors with an inner lobe. Upper premolars not imbricated . 



Color above and on sides, light chestnut brown ; beneath, dull white, with a tinge of chestnut. Length, 1J inches. Tail, 

 1 ,V Hind foot, 0.39 of an inch. 



