884 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
introduction and increase in New Jersey are given mainly on the authority 
of Mr. Jillson, and are fully covered by Mr. Jillson’s later and more detailed 
account already quoted. 
From the foregoing, it will be seen that from the single pair introduced 
accidentally to the fields about Tuckerton in 1867—only ten years ago—the 
species has spread over a belt of country some thirteen miles in length and 
probably several miles in breadth, and that its numbers already render it a 
farm pest, which evidently cannot be soon, if ever, wholly eradicated. It 
shows, furthermore, that the species is capable of multiplying in a region 
quite different from its original habitat. Whether the changed conditions 
will ultimately modify materially its habits and structure remains an inter- 
esting question for later investigators. 
TaBLE CXXIV.—Measurements of seven skulls of SPERMOPHILUS FRANKLINI. 
: Peal} on o an 
| | 6 = £ a es i EY | 
| = ig iS eS! 5 |agl|F 
i a ey) i) & &'3 a=] shila 
| = . a QQ a a =o |e 
iar: idea SO Sy ee es Sit ce NE eu eo eal ies eee 
oe see eee rel eer esa) Se es EH | 
| 3 Locality. ; 3 E 2 E E [2 Zi) & She sabe ee 
| 8 a) els eg et ee ge) 8 /23/8 | 3 fos | 
a Ee 2 ) oO o 2 oi-| = Seah eo | 
= oo a = AP ior ene Slaeolou Eg E 
lees =] 2 2 ° ° S yc etal Se) Pah =perit e wey || 
a) 2 teases || ebarsa Sem Race WAS el ae Se 
| = = a a nt = i} oo|/eq oO oo ° o o 
3 2/8 /2/2/2)| 8 |Balee] & REISS] & | E 
| 5 Bt OA Ween | ea eee ee) as ie eee es 
| 
13288 2.00 | 1.17 | 0.50 | 0.70 | 0.25 | 0.40 | 0.67 | 1.07 | 0.24 | 0.20 | 0.37 | 1.18 | 0.51 | 
13287 2.02 | 1.17 | 0.47 | 0.68 | 0.27 | 0.36 | 0.62 | 1.08 | 0.28 | 0.22 | 0.41 | 1.18 | 0.53 
HIS2RGi| = 2a otse. sce ee eee || coll eee ees 0.46 | 0.70 | 0.25 | 0.40 | 0.64 | 1.03 | 0.30 | 0.20 | 0.37 |.----.].----- 
| 13284 1.95 | 1.10 | 0.45 | 0.65 | 0.25 | 0.36 | 0.62] 1.03 | 0.27 | 0.20 | 0.41 | 1.14 | 0.45 | 
| 13285 NS EOH eae 0.37 | 0.64 | 0.18 | 0.30 | 0.50 | 0.98 | 0.22 | 0.21 | 0.41 | 1.08 | 0.45 
| 13281 1.96 | 1.16 |...... 0.66 | 0.25 | 0.40 | 0.63 | 1.05 | 0.26 | 0.20 | 0.41 | 1.17 | 0.59 | 
| 13233 2.10 | 1.21 | 0.49 | 0.74 | 0.25 | 0.40 | 0.68 | 1.14 | 0.29 | 0.23 | 0.42 | 1.22 | 0.56 
TABLE CXXV.—Measurements of twelve specimens of SPERMOPHILUS FRANKLINI. 
=| pe | | | ; a 
H ! | ine “4 2 
2 z | From tip of nose to— | Tail ne end | Length of— | 3 
2 of= ‘ 
a [5 Ne x oe eae = 
| 8 Locality. | | | g re 3 S 3 
& |S | “& eS $ $ S| e 
mee a | 3 oe ell Se Ab Sh ilare 
a by fe : i = | 2 = ° i=} oy) iz 
3 |= a) EI 8 Fe ee ie 5 A 3 3 
s oS aA Cy 3 ; 2 iC 2! 
Oo \9 n| A A ° ‘I > q is a q A I 
11592 PPR SEEM ERA CEST Stes | GREE | gach |falwls ah eny toe e Fresh. 
11993 ? | 0.90 | 1.80 | 2.20 9.00 | 5.00] 6.25 | 1.37 | 1.95 |.--...|.-- do. 
11586 o | 1.00 | 2.00 | 2.25] 10.00 | 5.00 6.60 | !.55 | 1.90 }......]....do. 
11597 |... S | 0.95] 250 | 2.30] 10.00) 7.00] 850] 1.35 | 200 ]-.....].-.. do. 
11601 |... 9 | 1.10] 1.90] 2.25] 9.75] 5.00 6850) 15351 22000) seen eee do. 
11602 |...- J | 1.60] 2.00] 235] 10.50]5.50] 7.00 | 1.40 | 2.00 ].---..].--. do. 
*994 |. f | 0.98] 1.80}255] 9.30] 4.40] 6.30] 1.27 | 1.97] 0.35 | Alcoholic. 
*911 |... of | 0.95] 1.75 ]}230} 9.00] 4.85] 5.00] 1.45 | 2.12] 0.32 ]....do. 
Bo40) eee fo | 0.98) 1.85 ]2.33) 8701 4.55] 6.00] 1.25 | 2.05 | 0.27 ]..-.do. 
*3762 9 | 0.95} 1.78) 215] 8.25] 4.351 5.80] 1.10} 1.90 | 0.27 |....do. 
*3761 |.... Bh] 05959] 00190) 25553] BAGO) eee eee 1.15 | 2.60 | 0.32 |....do. 
*3019 |.... fo} 1.00] 1.87) 235] 9.65] 4.75) 6.25 | 1.37 | 2.07] 0.35 |....do. 
ES eee ‘ 
% *In Museum of Comparative Zoélogy, Cambridge, Mass. 
