SCIURUS. 97 



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b. B Back dark chocolate 5. melania 128 



f. 5 Belly white. 



a. 6 Ear tufts present, whitish ; back 



gray or yellowish gray 5. yucatanensis 125 



b. 6 Ear tufts absent. 



a. 7 Ears bordered with black. 

 a. 8 Back very dark, lateral line 



reddish, ear patches rusty. . .S. boothice 128 

 b. 8 Back grayer, no lateral line ; 

 ear patches very large, 



white S. goldmani 130 



b. 7 Ears not bordered with black. 

 a. 8 Back gray. 



a. 9 Size large; total length 

 about 570 mm.; back 

 uniform; no lateral line. . . .5. griscus 130 

 b. 9 Size medium, total length 

 about 485 mm.; median 

 dorsal area rufous; lat- 

 eral line black 5. durangi 112 



b. 8 Back yellowish. 



a. 9 Ears pale rusty; flanks 



like back S. truii 1 23 



b. 9 Ears dull rusty; flanks 



washed with whitish ... 5. sinaloensis 122 

 c. 8 Back yellowish gray, coarsely 

 grizzled with black. 

 a. 9 Ears gray; yellowish of 

 back dull, sometimes 



very indistinct S. colli&i 121 



b. Ears rusty; yellow of back 



brighter, more buffy. . .5. c. nuchalis 122 

 e. 4 Belly not blackish or white. 

 a. 5 Belly buffy. 



a. 6 Back with median area blackish 

 or dark brown, rest of body 



buffy S. a. dorsalis 127 



b. 6 Back with median area not 

 blackish. 



a. 7 Ears black-edged S. variegatoides 129 



b. 7 Ears not black-edged ... .5. managuensis 129 

 b. 5 Belly rufous. 



