RODENTIA—SACCOMYINAE—PEROGNATHUS PARVUS. 
List of specimens. 
425 
- l | 
2 | | Measurements. | 
BE. | | c e le je le ls le On ee 
2/2 | | o 2 |e |S je o 5 5 s 
E se] . Locality. When col- Whence and how ob- ie Natureof},, |, lo lo Io |= Z = | Collected by— 
& st] 9 lected. | tained. | 5 specimen. /3 16 (|S 2/3 |§Sle che -| oo | = | 
> E- = = ec BSED eS Z\°s|oe| oc 2 
& &°|z \z lee Oe Ole Se SS SlaSlas| « | 
2s 1s = 6 |6 jose 3 S7\3/8 
oOo ik Eo net iS a 
6 |% ze ee a eee as |S || ome baat [pes 
oo |n ° eee ee PW A Ale 
QBS .ece}roee Between Milk & Maria |Sep. 4, 1853 Gov. I. I. Stevens....)..-. In alc...) .40) .75, .95.2,252.15} .30) .70) ¥.23}i5<| Bri Suckley.. 
rivers, Neb. | | | | 
2614 ....Jeee. Ree Fork, Neb......... Sep.24, 1856 Lieut. F. T. Bryan... 352)...do..... 45} .80) .952.402.20) .30) .66)....'.... 
1931 ....] © | Republican Fork, Neb. ./Sep. 27, 1856........ GO. vesceceeee 363|...do Re cis 40) .70, .85,1.821.90) .28| .60|....|.... 
Aso 1204 +es.| Grand White R., near | 1853 eel Capt. E.G. Beckwith. 6 Mounted.|.... oad dae bt | ae seveleccelevee| 
Lit. Salt Lake, Utah. 
440 1505|....| Rocky Mts., 38th par...| 1853......./06. sees flo.ncse Becca eoe wedlOrcoesl deae| polaals ASG Peri Pere jones] 
270° 1665}....| Cimarron Riv., (Sand | 1853....... John Potts........... baa Skin ....| .42].. 83 2.17,2.00 -60| .83 .25 
/ Cr.,) N. M. | | 
1043.....).... San Antonio to El Paso, | 1854.......| Maj. W. H. Emory...|-... Alcohol..| .45] .74) .942.202.20) .30} .60)....|..../ 
Texas. | | | | | 
1041... «| El Paso to Los Nogales, | 1855.24.45 )seee ees dow... cece + dOscees -38) 70) .852.001.80) .35) .63)....).... oedOs.cseves 
Sonora. | | | | 
148 1130 El Paso.....004seeeeeee 1851......4/ Col. J. D.Graham....|....| Skin .e.[eese/eoes 2,002.04] .95] .69]....|....| J. He Clark. 2... 
| i | 
223 seceleces Chihuhuatrip......-seejeeeeee oe Dr. T. H. Webb...... ro Tn ale 40} .68) .851.851.60) .22) .58}. he|-- «| cece cevess eves .. 
wis: s-[eees| Matamoras ....+0eeees- seececeeesss| Lieut. D, N. Couch ..}....|..- do..... ~45) -B0), .95.2.15,2.40 -35| .63)....|....| Dr. Berlandier.. 
| | | 
+ Longest fore claw .11; longest hind claw 08. 
PEROGNATHUS PARVUS. 
Cricetodipus parvus, Prater, Mamm. and Birds U.S. Ex. Ex. 1848, 53. 
Perognathus parvus, Leconte, Pr. A. N.Sc. Phila. VI, Jan. 1853, 225. (His specimen may have belonged to P. flavus.) 
Perognathus (Cricetodipus) parvus, Aup. & Bacu., N. Am. Quad. III, 1854, 328. 
Spr. Cu.—Smallest known species of American rodent? Above, buff, mixed with dusky; beneath, white; entire fore leg 
white. Tail rather longer than the body. Hind foot from heel nearly as long as the head. 
The single specimen collected of this species is not quite mature or perfect enough to admit 
of a satisfactory description. 
species examined, especially in the longer tail and hind feet, both of which exceed those of 
P. flavus. 
tered hairs, as in the latter species. 
54 L 
It exhibits, however, decided marks of difference from the other 
The auricle is without the lobe of the antitragus, and the sole is covered with scat- 
