64 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
8. argentatus. 8. aquaticus. 
wae.0 | 3036. | 958. | ARs, 
Tenp thiol Stow sa eee eee py. aa eee 1.40 1.30 
Greatest width (=o. 0" = oso. -p seen eee . 80 ays . 70 - 67 
Least interorbital space ...------------------- .33 . 32 - 30 31 
Width of noseitaereas cence cone e enon a . 20 . 20 15 . 16 
ihengthof palate = aan enema se eam 72 - 69 . 67 - 60 
Width outside the molars -.....------------- -45 42 - 38 - 39 
* From St. Louis. 
Measurements. 
Nose to— Tail to end of—} Length of— 
Current Locality. Nature of spe- 
number. cimen. 
Occip | Root of | Verteb. | Hairs. |Hand.| Foot. | Breadth of 
tail. palm. 
1922") West of Wort' Riley <--2-=---- 1.75 6,25 jet 1 Ua ul et bg ac Se .78 From alcohol - 
Ob) a AL LOM ee te = Sete e eel meme a HS )\Ue SEE Bes Seema be eine -88} .85 94 Specimen---_-. 
2196 StLonis, Mo.t Sssse5. ees 1.90 4.98 A id he ie | ee -90 =. -2dOssteeeke 
BGT {Leos 2 doe sister. hea besaes VARE Ie eerie eles pl syed be Smee Pate es oe 805/25. dere 
2199) tes 23 0 ea oe es ee ae 1.80 rtf Aan | oe Eee a eel ee Py fs Hn) see. Yor Es 
2200 |.-.--- OS te ae 1.74 a" a Pa ee Ses! ead ee ee nt Pee hae emer eC 3 * = 
2i0i6 «| Mort smith, Ark _o-- 2. po oces 1.73, ze Rg ale pes a ary [ES Sy Se 10), ¢ \nn eO aeeee 
2186 | Prairie Mer Rouge, La_--._-.--- 1. 82 IT el a ac A et el pa | pe PR ~ 82 * |. sidoseeeaee= 
2214 | Columbus, Ohio ---.--.-----.-- 1.89 4, 38 112 +) 1.29 90 85 283" “|25. doer seeaee 
This species was first described from a specimen collected in Michigan by Dr. Geo. Leib. 
is essentially a prairie species, where it replaces the S. aquaticus of the east. Its extreme range 
to the west has not yet been ascertained. 
List of specimens. 
Catalogue 
number. 
Corresponding 
No. of skull. 
No. of 
specim’s. 
Locality. 
Dréemont, Men cceo see oeemes 
Alton, Ill 
Columbus! Ohiom. 2-25 ees sees 
BG wOuis, MOe pas come. Son eee 
Prairie Mer Rouge, La 
Fort Smith, Ark 
Mouth cf Big Sioux, Nebraska. 
20 miles west of Fort Riley, Kan- 
Whence obtained. 
It 
Nature of specimen. ~ 
Wied. Bhanpcse= oom Dry, skin): : 2282628 
R, Kennicott ~~... Alcohol ;...22. see 
i. Lesquereaux ~--.---. |... 0-2. ..tap pane 
Dr. Engelmann -.------- Dry and in alcohol. 
On Haile sceseade ses. Alcohol’ to sacenee 
Lieut. “Whipple <.---2.--|-... dosiz J SosSteee 
Lieut. G. K. Warren and | Skin............-. 
Dr. F. V. Hayden. ; 
Lieut. F. T. Bryan and | Alcohol -.......... 
W.S. Wood. 
