ANTHONY — NEW RODENTS AND BATS 
81 
NEW RODENTS AND NEW BATS FROM NEOTROPICAL 
REGIONS 
By H. E. Anthony 
Upon taking up work on collections of South American mammals 
accumulated in the American Museum during the past three years, 
several apparently undescribed forms have been discovered. They are 
hereby set forth in a preliminary paper, pending a detailed report on 
the entire collections which will be delayed for some months. 
Acknowledgment is made of the kind loan of comparative material 
by Mr. Gerrit S. Miller, Jr., Curator, Division of Mammals, United 
States National Museum. 
Microsciurus septentrionalis sp. nov. 
Type, No. 41235, Dept, of Mammalogy, 9 , Sabalos, on Rio San Juan at junction- 
of Rio Sabalos, Nicaragua, May 12, 1917 ; collector, Wm. B. Richardson. 
Characters . — Similar to M. alfari in general appearance but with less rufescent 
pelage, above and below, and with post-palatal region noticeably longer and 
molar teeth smaller. 
Color . — Upperparts presenting a grizzled olivaceous appearance, the hairs 
slate black at the base and tipped with honey yellow, top of head slightly more 
ochraceous ; underparts warm buff ; tail, above mixed cinnamon-rufous and black, 
the hairs being banded with alternate bands of each color and tipped with a yellow 
shade more like that of the light tipped hairs on the back, below very much as 
above. 
Skull . — Like that of alfari but with longer palate, the post-palatal notch not 
reaching to plane of last molars. 
Measurements (taken in the flesh). — Total length, 240 mm. (250) tail verte- 
brae, 100 (120) ; hind foot, 30 (30) ; hind foot measured from dry skin, with claws, 
37 (37.3). Skull, occipito-nasal length, 33.7 ; zygomatic breadth, 21.6; breadth of 
braincase, 18.1; interorbital breadth, 14, length of nasals, 10; length of maxillary 
toothrow, 5.3. 
The Nicaragua squirrel presents rather a puzzling problem as to 
aflflnities. Logically it should be closely related to alfari, the type 
locality of which is about 80 miles to the south, but in some charac- 
ters it more closely resembles isthmius vivatus from Panama. The type 
of coloration of septentrionalis, olivaceus in general appearance, is well 
contrasted with the ferruginous pelage of alfari (type specimen) but 
compared with isthmius vivatus this difference is not very great in either- 
the upper or lower parts. 
1 Measurements in parentheses are of topotype. 
