e 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.
~Reithrodontomys microdon microdon~ Merriam.--GUATEMALA.--Huehuetenango: 2 mi. S San