s gracilis harrisi_~ Goodwin.--NICARAGUA.--Esteli: 9
mi. NNW Esteli, 1 (KU 71342--July 15, 1956). Managua: 3 mi. SW Managua,
15 (KU 71345-59--February, May, June, 1956); 4 mi. W Managua, 2 (KU
71360-61--June 26, 28, 1956).

Comments on the series from 3 mi. SW Managua have appeared elsewhere
(Englert, 1959:153). The specimen from 9 mi. NNW Esteli contained four
embryos that measured 5 mm. in crown-rump length.

~_Reithrodontomys gracilis pacificus_~ Goodwin.--EL SALVADOR.--San
Salvador: 1 mi. NW San Salvador, 1 (KU 71396--July 29, 1956).

In coloration (being but slightly paler), and in small size, this
specimen resembles the description of _R. g. pacificus_ given by Hooper
(1952:135) and ten specimens of _pacificus_ (nine from Guatemala and
one from Chiapas) examined by us. Because of this resemblance and the
marked contrast with specimens of _R. g. anthonyi_ discussed above we
assign this specimen to _pacificus_. In comparison with two topotypes
(AMNH 79062, 79090) of _R. g. anthonyi_ from Sacapulas, Guatemala,
taken on February 9 and March 2 that are essentially the same age as KU
71396, the latter specimen is darker dorsally, the tail is darker both
dorsally and ventrally, and the skull is smaller. In paleness of upper
surface of hind feet, length of palate relative to length of incisive
foramina, and size of bullae, KU 71396 resembles _anthonyi_. We
interpret these resemblances to _anthonyi_ as evidence of
intergradation between _pacificus_ and _anthonyi_. Felten (1958:9)
referred two specimens from El Salvador (one from San Salvador and one
from Amate de Campo, Departmento de La Paz) to _anthonyi_, without
comparison with _pacificus_ and with no mention of examination of other
specimens of _Reithrodontomys gracilis_. When the distribution and
variation of _R. gracilis_ in this region are more adequately known
these two specimens may well be reassigned to _pacificus_. Hooper
(1952:134) observed that two specimens from Monte Cristo Mine in
eastern El Salvador were the smallest and darkest of the _R. g.
anthonyi_ examined by him and approached _R. g. pacificus_ in these
particulars. Possibly these specimens from Monte Cristo Mine also
should be assigned to _pacificus_ rather than _anthonyi_. External
measurements of KU 71396 are: total length, 167; length of tail, 99;
length of hind foot, 19; length of ear from notch, 13. The specimen
contained four embryos that measured 10 mm. in crown-rump length.

~_Reithrodon