190 Bulletin American Museum of Natural History. [Vol. XXXIV, 
district, Colombia; altitude 400 feet. Specimens examined, 5, including the 
type and two topotypes. 
Microsciurus otinus Thomas. Medellin, Colombia. Specimens exam- 
ined, 3, including the type and a topotype. [See Addenda, p. 307.] 
Microsciurus isthmius isthmius Nelson. Rio Truandé, Isthmus of 
Darien, Colombia. Specimens examined, 10, including the type and a 
topotype. : 
Microsciurus isthmius vivatus Goldman. Near Cana, eastern Panama; 
altitude 3500 feet. Specimens examined, 3, the type and 2 topotypes. 
Microsccurus miumulus Thomas. Cachavi, Esmeraldas, Ecuador; alti- 
tude 560 feet. Specimens examined, 14, including the type and 2 topotypes. 
~ Microsciurus palmert Thomas. Sipi, Chocé district, Colombia; altitude 
150 feet. Specimens examined, 12, including the type and 7 paratypes (one 
of them a topotype). 
Microscvurus simonst Thomas. Porvenir, Bolivar Province, Ecuador; 
altitude 5000 feet. Specimens examined, 1, the type. 
Microsciurus peruanus Allen. Guayabamba, Peru; altitude 4000 feet. 
Specimens examined, 1, the type. | 3 
Microscvurus napi Thomas. Mouth of Rio Coco, upper Rio Napo, 
Ecuador. Specimens examined, 1, the type. | 
Microsciurus brevirostris Allen. Chanchamayo, central Peru; altitude 
5000-5300 feet. Specimens examined, 5, including the type. 
Microsciurus florencie Allen. Florencia, Caqueté district, Colombia; 
altitude 1000 feet. Specimens examined, 4, including the type. 
Microsciurus avunculus Thomas. Gualaquiza, Ecuador; altitude 2500 
feet; specimens examined, none. 
This list differs from the one given in my paper on Microsciurus pub- 
lished in February, 1914 (this Bulletin, XXXIII, pp. 145-165), through 
the omission of three species and the addition of one, the latter described 
since its publication. Of the three omitted one, chrysuros, is now referred 
to Leptosciurus (see below, p. 200), and two, pusillus and kuhlii, to Sciurillus, 
since established by Thomas, who refers kuhlii to pusillus as a synonym. 
These three forms were unrepresented in the material available to me for 
examination. The number of forms now recognized is 17, of which 13 are 
given the rank of species, with 4 additional subspecies. 
The bibliographical references, the type localities, and the geographic 
ranges of the above forms here follow; but the descriptions (given in the 
former paper) are omitted. 
