SCIURID.E — SCIURUS GERRARDI. 



7f>7 



ratlier darker above and less varied with yellow. The other (No. 3647, a 

 breeding female) is more varied above with reddish-yellow than either of the 

 others, and rather paler below. The tail, as in the others, is partly black 

 and partly red. 



This species has essentially the same style of coloration as Sciurus vari- 

 abilis, but differs from it in its smaller size and much smaller ears. Like 

 that species, it probably runs into phases in which the ventral surface is 

 white. It differs from Sciurus cestuans in being much larger and in colora- 

 tion, it much exceeding in size even its larger northern variety, and being 

 much redder. The Nercua specimens, however, much resemble it 'in 

 coloration. 



Dr. Gray's description and figure of his Macroxus gerrardi from New 

 Granada agree very well with the specimens above described, differing only 

 in his S. gerrardi being white below. As, however, one of the Panama 

 specimens is very pale below (nearly white), and the allied species all present 

 white-bellied phases, I adopt the name gerrardi for this species. Gray's later 

 description of his M. xantlwtus from Veragua agrees well with the speci- 

 mens from Nercua; and I also refer more doubtfully to this species his M. 

 bruneo-niger from Brazil and his M. ignitus from Bolivia, not feeling sure, 

 however, that both the latter may not be referable to S. cestuans var. rufo- 

 niger. Assuming, however, that these supposed species are referable to the 

 species here called S. gerrardi, we should have the habitat of the latter 

 extending from Costa Rica to Bolivia. 



Table LVIII.— Measurements of seven specimens of Sciurus gerrardi. 



Id Museum of Comparative Zoology, Cambridge, Mass. 



