236 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
a 
as the fragments show, are a little lighter brown than most of Mr. Goss’ 
late winter and early spring skins, especially No. 1368, which has also the 
tail more distinctly bicolor than it is in these. But some of the Kansas ones 
are identical in color with the types; and they vary as much among them- 
selves in color as some of them do from Nos. 1367-8. The tails of all, except 
No. 1368, are not evidently bicolor. The under parts are hoary-ash, usually 
soiled, especially across the abdomen, with pale muddy-brown, somewhat as 
in A. austerus, but not approaching the cinnamon shade that the latter fre- 
quently exhibits. The tail and feet in dried skins are dark fuscous ; in alco- 
holic species light brown, with a flesh-colored shade. The incisors are yellow, 
as usual; the claws brownish-white. Besides the copious long fine pelage 
of this animal, there seems to be something peculiar in the tenderness of the 
skin itself; the feet are detached almost at a touch, so that the labels cannot 
be secured in the ordinary way. The following table shows to some extent 
the range of variation in size :— 
TaBLE LIX.—Measurements of eighteen specimens of SYNAPTOMYS COOPERI. 
Nose to— Eailite 
end of— “ 
A 
2 Date. Locality. Collector. do |fie=F as Remarks. 
8 4 BW 
a lelelSlalelgleleie : 
a |e aed el Ga GG ea Gale 
TSH easel lace sacesdalsos Unknown (U.S.?).| W. Cooper... -.- woms|e nm toatl wee) coos] ee ST canela-=| ypelof-coovert. 
1 S68) pee | tema eee a Set SARE Sasecese Boel) 22a Ss -«--|----].---| -- [0. 80/0. 90/0. 32)0. G8)... .]....do. 
3798 |... Aug. 6, 1859] Skagit Valley,Oreg) C.B. R. Kennerly|..-..|.--.| --.]3. 56/0. 75)0. 88)0. 34)0. 70,0. 43] Measured dry. 
8464 |....| Winter,’65-6 | Neosho Falls, Kans} B. F. Goss. .---.. 0. 50)0. 90/1. 16)3, 60}0, 60)0. 70,0. 36)0. 670. 35}. ..do. 
8502 | gi | Mar. —, 1866]. -- nO eaoeee eee 0. GO}1. 10)1. 25)4. 12/0. 75,0. 90,0. 40)0. 78:0. 40) .. ..do.* 
8509 | oi | Feb. —, 1866]. --. Pel! Oeesemeccare 0. 57) L. 07/1. 20/3, 75)0. 80)1. ooo. 42/0. 76,0. 30). ...do. 
8510 | 9 | Mar. —, 1866 ].-.. eG Owes ae eee (0, 52)0. 95) L. 25/4, 30/0. 80/0. 95.0. 38)0. 78/0. 35]... .do. 
8511 | 9 | Feb. —, 1866]. -- Wd) o once e058 AU FS BLE be) CUA CAL IE ct fool 
8512 | oi | Feb. —, 1866]..-- a0 see eee (0, 59/0. 98) L. 18/3. 75]0. 85)1. 00.0. 41)0, 75,0. 34]. ...do. 
8513 | @ | Mar. —, 1866]. --- ==: 0eeeteesees 0. 56} L. 00) 1. 23/3. 60/0. 85)1. 00 0. 39)0, 76,0. 36] ....do. 
8514 |....| Spring, 1866 |.--- il pO Omen eaeecree 0. 53)0. 98) 1. 25)4. 00}0, 65)0. 800. 45)0. 75)0. 38) Measnred alcoholic 
53 bl ee Bee eee ere Bet pee poe mseae 0. 50}1. 00/1. 30)3. 75/0. 64/0. 78.0. 46/0. 76/0. 40) .. ..do. 
BdLGH oy! oO) nena ene See GO een 0. 4740. 90}1. 10)3. 20}0. 55)0. 65,0, 40)0. 69/0. 39). . ..do. 
EY fil ers Gee et memo facies doe — oceans poodil) sFenekiasnes 0. 45)0. 85/1. 10/2. 90)0. 51)0. 60,0. 33,0. oe .---do. 
OSG STON Sete a aate ---| Brookville, Ind ...| R. Haymond - .. .|0. 46)0. 901. 10)3. 25)0. 58 0. 80:0. ye 70\0. 37]. ...do. 
10575) |e ecleac. = -| Benton Co., Minn-| O. E. Garrison ..|0. 44/0. 90) L. 10/3. 30)0. 60,0. 750. 33.0. 69)0. 43)... ..do. 
Tee OE oes ---| Southern Tlinois.-| R. Kennicott. - -.|0. 40/0. 90)L. 10/3. 50)0. 60,0. 700. 35)0. 70)0. 35)... .do. 
10957 | f | Feb. —, 1867] Nulato, Alaska....| W.H. Dall...... 0. 41/0, 89) L. 09'3. 500. 75)1. oO 40,0. 72/0. 40). -..do. 
* But the length of head and body and of tail are as taken in the flesh by Mr. Goss for Nos. 8508-13. He seems to haye 
taken the tail-measurement farther up the coccygeal vertebra than is generally done, so that the tails as given equal that 
of No. 1368, whereas they are certainly shorter. Our measurements of the dried tail, did we make any, would run fully 0.10, 
if not 020, less than Mr. Goss’ figures. Our measurements of the alcoholic specimens are the most reliable of the series. 
Nos. 8516, 8517, are not full grown. 
t In No. 9963, apparently a nursiug female, we find two pairs of pectoral mamma and one pair of inguinal mamma, 
without being able to make out any intervening ventrul ones. Itis probable, however, that the species possesses a ventral 
pair, making eight teats in all. 
