420 Dr. J. E. Gray's Si/nopsis of the American Squirrels 



are generally iron-grey and of larger size; and the southern are 

 olive, more or less punctulated with yellow, of middle size or 

 sinall. There are one or two of the olive species found in the 

 north as well as the south part of the isthmus. 



I. Fur thick, soft, iron-grey, white- or yellow-washed, rarely entirely 



black ; of a large or middle size. Inhabiting North America 

 to Panama. 



A. The fur iron-grey , or grey yellow-washed, or black ; hairs black, 



often with white tips ; tail blackish, grey-edged. 



a. Belly white. Nos. 1, 2, 3. 



b. Belly red or reddish white. Nos. 4, 5. 



c. Belly black. Nos. 6, 7, 8, 9, 10. 



B. The fur pale grey ; hairs grey, black-ringed : or black, the hairs 



being entirely black. 



a. Belly white. Nos. 1 1, 12, 13. 



b. Belly yellow. Nos. 14, 15. 



c. Belly red. No. 16. 



II. Fur short, soft, olioe-brown, black- and yellow-puncttdated, 



rarely red-washed ; hairs black- and yellow-ringed. Moderate- 

 sized or small. Inhabit South or Tropical America to Panama. 



A. Tail black ; fur very short, belly nakedish. Middle-sized. 

 No. 17. 



B. Tail black, red-washed ; fur moderately soft. 



a. Belly red; cheeks red. Nos. 18, 19, 20, 21. 



b. Belly red or reddish; cheeks grey. No. 22. 



c. Belly white; cheeks grey. No. 23. 



C. Tail blackish or grizzled, grey-ivashed, or more or less unnu- 



luted. 



* Middle-sized. Belly white. No. 24. 



** Middle-sized. Belly reddish. No. 2.5. 



*** Middle-sized. Belly dark grey . Nos. 26, 27. 



**** Middle-sized. Belly yellow. Nos. 28, 29, 30. 



***** Very small. Belly grey or lead-coloured. Nos. 31, 32. 



III. Fur rather harsh, short ; sides with a narrow reddish streak. 



No. 33. 



I. Northern species, of a large or middle size. Fur soft, iron-grey, 

 white- or yellow-washed, sometimes entirely black. 



A. The fur iron-grey or black ; hairs black, often with a white 

 tip ; tail blackish, grey-edged. 



1. Macj'oxus vulpimis. 



Sciurus vulpinus, Gmelin, S. Baird, M. N. A. 246. 



Sc. niger, Linu. 



tic. capestratus, Bosc. 



