are not included in this
report.

All place names are on the map of Hispanic America published
by the American Geographical Society and can be located by
consulting the "Index to map of Hispanic America" (Vol. 1,
Geographical names in Central America, U. S. Government
Printing Office, Washington, D. C., 1943.) All measurements
cited are in millimeters.

Support for field work was provided by the Kansas University
Endowment Association. Support for the laboratory phases of
the work came in part from a grant from the National Science
Foundation. Most of the specimens herein reported were
collected by James W. Bee in late 1954 and early 1955, and
by J. R. Alcorn and A. A. Alcorn in 1955 and 1956. A few
that were collected earlier by other persons are mentioned.
We are indebted to the following individuals for the loan of
specimens in their care: R. G. Van Gelder, American Museum
of Natural History; Philip Hershkovitz, Chicago Natural
History Museum; W. H. Burt and E. T. Hooper, Museum of
Zoology, University of Michigan; and D. H. Johnson and C. O.
Handley, Jr., U. S. National Museum.

~_Reithrodontomys sumichrasti australis_~ J. A. Allen.--Seven specimens
from the vicinity of Volcan Irazu, Cartago, Costa Rica, are from within
the geographic and altitudinal range recorded for the subspecies by
Hooper (1952:82).

One female, KU 26967, trapped on March 2, 1947, on the SW slope of
Volcan Irazu, 8500 ft., contained five embryos that were 17 mm. in
crown-rump length.

~_Reithrodontomys sumichrasti dorsalis_~ Merriam.--A total of 93
females are among 195 specimens from 24 localities in Guatemala that
lie within the geographic and altitudinal range recorded by Hooper
(1952:78) for _dorsalis_.

Two females were pregnant; KU 71363, taken on January 28, 1956, 7 mi.
E, 2 mi. S La Union, Quetzaltenango, Guatemala, contained three embryos
that were 7 mm. in crown-rump length, and KU 65245, taken on December
15, 1954, 1 mi. NE Nebaj, 6000 ft., El Quiche, Guatemala, contained
four embryos that were 15 mm. in crown-rump length. These two females
were the only pregnant ones among 36 taken in December, 23 in January,
1 in February, 19 in March, 5 in April, and 9 in August.

~_Reithrodontomys fulvescens chiapensis_~ Howell.--GUATEMALA.--Baja
Verapaz: 1/2 mi. N, 1 mi. E Salama, 3200 ft., 1 (KU 65378--January 28,
1955); 1 mi. S Rabinal, 345