easured 5
mm. in crown-rump length.

_Measurements._--Selected measurements of the holotype,
followed by the average and extreme measurements of six
specimens of _meridionalis_ (including the holotype) from
the vicinity of the type locality are: total length, 154,
152.0 (148-154); length of tail, 82, 82.0 (81-83); length of
hind foot, 17, 18.0 (17-19); length of ear from notch, 13,
13.3 (12-14); total length of skull, 21.4, 21.13
(20.3-21.7); zygomatic breadth, 10.0, 10.38 (10.0-10.6);
breadth of braincase, 10.1, 10.17 (9.9-10.4); depth of
skull, 8.2, 8.00 (7.8-8.3); interorbital constriction, 3.7,
3.53 (3.4-3.7); breadth of rostrum, 3.8, 3.75 (3.6-3.9);
length of rostrum, 7.4, 7.33 (7.1-7.7); length of incisive
foramen, 4.6, 4.47 (4.2-4.6); length of upper molar
tooth-row, 3.2, 3.32 (3.2-3.5). Corresponding measurements
of a specimen from 11 mi. SE Dario are: 153, 82, 18, 13,
20.7, 10.3, 10.1, 7.8, 3.4, 3.6, 7.2, 4.3, and 3.2.

_Specimens examined, 8, as follows_: NICARAGUA.--Esteli: 9
mi. NNW Esteli, 4 (KU 71386-89--July 15, 1956); 8 mi. NNW
Esteli, 3 (KU 71393-95--February 5, 1956). Matagalpa: 11 mi.
SE Dario, 1 (KU 71392--March 21, 1956).

Specimens of _Reithrodontomys fulvescens helvolus_ used in
comparisons: OAXACA: 3 mi. ESE Oaxaca, 1 (KU 68891--June 24,
1955); 3 mi. W Mitla, 4 (KU 68892-95--August 5 to 9, 1955).

~_Reithrodontomys gracilis anthonyi_~ Goodwin.--EL SALVADOR.--Santa
Ana: 2 mi. SE San Cristobal, 2950 ft., 2 (KU 65401-02--March 6, 1955).
GUATEMALA.--Jutiapa: 2-1/2 mi. W, 2-1/4 mi. N San Cristobal [El
Salvador], 2900 ft., 5 (KU 65396-400--March 6, 1955).

The subspecies _anthonyi_ has been known previously by seven specimens,
none of which is fully adult, judging from Hooper's (1952:134) comment
that the adult pelage of _anthonyi_ is unknown. Six of our seven
specimens are clearly adults as is shown by well-worn teeth and degree
of development of temporal ridges. The seventh is a young animal in
process of postjuvenal molt. Individuals from our series in general
resemble specimens of _Reithrodontomys mexicanus orinus_ from the
vicinity of Guatemala City but differ from the latter as follows:
dorsal pelage brighter (with less suffusion of black), "peppered" in
appearance, shorter and sparser; ears distinctly paler, owing both to
the paler color of the skin and the paleness of the ha