MURIDAE—SIGMODONTES—HESPEROMYS LEUCOPUS. 55 
TABLE IX.— Measurements of seventy-five skulls of HESPEROMYS LEUCOPUS, §c.—Continued. 
Locality. Specimen and remarks. 
Number.* 
Interorbital width 
Length of lower jaw. | 
Zygomatie width. 
| Length. 
| Height. t 
Monterey: Call es sees oe 
-00 | 0,37 | 0.53 | 0.17 | 0.65 | Typical of “ gambeli”. 
Br Son Ol see nates Wetec nie miae 5 
1 
. 1 
Port Peyony Cae eee || WO4 0N4 3! 10.54) | Onna 2 eee Representing “ gambeli”. 
1 
1 
a eee (OGese erase este saree rae| Pee) |e ae see eeterorsal OST: | OsGon |e eidor 
Se eet O) sate iaetae seeetemce ep Onn) Onsale Ou5On|.O: 160 1OsG1 
Simiahmoo, Wash -..--.----] 1.00 | 0.37 | 0.50 | 0.17 | 0.64 | Supposed “austerus” or “boylii.’ 
Steilacoom, Wash ....---.-.| 0.95 | 0.35 | 0.45 | 0.15 | 0.60 | Typical of “austerus”. 
pease Oye ee mete a eaters Onan | NOs steal | peta OG eeetee eee eet cl gy 
Charco Escondido .. -.--.--| 1.00 | 0.38 | 0.54 | 0.17 | 0.64 | Representing “ texanus ”. 
Pecos; Riyer;N- Mex---: -- 5.0.96: |)(0: 38!| 0:50"| 0219) | 0)62°).=.. =: do 
Tie aso hex naetineeys. eeraee MOAN RO oo eee OnU8) ROSGG ese ee do. 
Turkey Creek, Tex. -....-.: 10H OF 407) 08551105 188" 0: G8) |e 22. do 
INR ASO NOs en ayoneee 1.10 | 0.40 | 0.54 | 0.20 | 0.68 | Purporting to be var. sonoriensis. 
Sosccsss 1,10 | 0.43 |. --.-| 0.20 | 0.69 | Representing sonoriensis. 
Q29G HF05 400 ON48: | OF 16) | 0259/5. 2222 do 
ONO TaNOs42 | FOnGOs 80: U7 ONS |Ra5--- do 
LOZ ON SS lciseioe OLAS |= t= Var. sonoriensis. 
TOS OC SSN | FOFD32 | 1ON13) | hONGS) | aee = do 
1.03 | 0.36 | 0.50 | 0.17 | 0.60 }..-.-. do 
TeVoneUooe eeee=e Gn ROL Gen boss as do 
NSEC 0.96 | 0.36 | 0.50 | 0.17 | 0.60 | Representing “ gambeli”. 
EScScciosoas 0.94 | 0.37 |....-.].--...]-..---| Type of “campestris”. 
1.11 | 0.41 | 0.56 | 0.20 | 0.70 | Typical of HH. californicus. 
Mee ea especies 0.90 | 0.38 | 0.49 | 0.16 | 0.60 | Typieal of H. michiganensis. 
scpesclibiassaS 3 S55 be SSHe 0.94 | 0.37 | 0.48 | 0.16 | 0.60 |......do 
no SeRUN SR tiso eee seen ee OF 83) b0535))|es- 6 Old O57 |S--oeedo. 
RACING AWASe =n eee QRO2 ROL SG essen. ONa OS 60) |b=se-< do. 
Saint Louis, Mo..---.....--. OFSSe TON40h PSs 0.17 | 0.64) Typical of H. aureolus. 
Knoxville, Tenn -.----...-. 1.02.) 0.40") 0.55 | 0:19 | 0.68'|.----. do 
Kemper County, Miss .---- 1.01 }°0.40 | 0.52) 0:18.) 0.64 }..-.-. do. 
Society Hill, S.C ..--.....- [LON OFAC OSS7 O20) 056555 do. 
Schuylkill River, Pa ...-... 1.05 | 0.40 | 0.51 | 0.18 | 0.68 | Hl. aureoltus? 
fou | Carlisle, Pis.2..-.).05-22---: 1.00 | 0.39 | 0.51 | 0.18 | 0.64 | H. aurcolus? 
That. | Wha nan Wroesectseees eee 0.99 | 0.38 | 0.50 | 0.18 |....-- 
*Tn the fractional numbers, the numerator is that of skull itself, the denominator being that of the corresponding skin. 
1 The “ height” is taken by laying the skull on aglass plate (when it rests upon the incisors and bulle ossex), and measuring 
from the glass to the highest point, which is at the parictals, in a perpendicular that passes slightly in front of the bulle. 
| From tip of iucisors to back of condyle. 
All the skulls of obviously ungrown animals are excluded from the fore- 
going table as tending to vitiate general results, although there are many 
included of specimens in the gray state of pelage. 
On examining the table, it will be seen that the chief discrepancy the series 
affords is in the case of H. michiganensis. his averages noticeably less than 
