SCIURID4—SCIURUS GERRARDI. 767 
rather 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 Sctwrus estuans 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 Macrorus gerrardi from New 
Granada agree very well with the specimens above described, differing only 
in his S. gerrardi bemg 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 JL zanthotus from Veragua agrees well with the speci- 
mens from Nercua; and J also refer more doubtfully to this species his M. 
bruneo-niger from Brazil and his MZ ignitus from Bolivia, not feeling sure, 
however, that both: the latter may not be referable to S. estuans var. rujo- 
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. 
eI Tail to end | 3 
S E From tip of nose to— £ Length of— | 
6 ok fe : ° 
ee g z 
5 - 
a 5 f | as T =a Ga (eo 2 
} B Locality. =) ; Sa] e 2 ~ % 
8): ey 3 S| dee ee ales 2 
= asa s é s = = = z 2 = =p S 
S i 2 = 3 = aay = 
2] a 3 3 s S = 2 e 
516 fata fm jo) a} > |e | ee | | z 
se — jee es ae | ae 
3302 | 234 OS | same | oars | em 10.50 | 7.25 | 9.25 | 1.40 | 2.20 |...... | Skin. 
3301 |..-.- ff |/eseascl Aceon 9/50) 67.2591 9'25.) 2040) oes oe ..do. 
3300 | 225 5. Ano i =Se68 nacecs mot 9,75 = |l sssee L900) S540) Poona ... do. 
*O224) |. .2 5. I.thmus of Darien.......---.-.--. Jo} 1.05 | 2.05 | 2.45 | 9.75 | 8.00 [10.25 | 1.55 | 2.25 | 0.05 | Alcoholic. 
ELEN eee Obispo, Panama. .....-.-- aaeeaeee } 2.00 | 2.45 | 9.70] 8.75 |10.90 | 1.50 | 2.10 | 0.60 |..-do. 
63 (| eae) |e (1 eee 1.95 | 2.32 | 8.65 | 8.00 | 9.25 | 1.42 | 2.06 | 0.60 do 
cit ee OG) fon ec masons awe ssw eescacess 1.85 | 2.40 | 8.70 | 7.50 | 8.90 | 1.65 | 2.25 | 0.65 do. 
' 
* In Museum of Comparative Zodlogy, Cambridge, Mass. 
