304 BULLETIN UNITED STATES GEOLOGICAL SURVEY. \rol.n. 



The genus may be subdivided in the following manner : 



I. — Squirrels of the Europ^o-Asiatic Ebgion. 



A, Head rounded, short, and depressed; nose blunt [rond); tail* 

 longer than body and head, broad and distichous (in the breeding 

 pelage). Molars |-. Size very large. — Subgenus Eosciurus, Trt., 

 1880. 



Type : Sciurus Mcolor, Sparrm., of Asia and Malasia. We place in this 

 subgenus the following species, all of the same zoological region : 



1. Mcolor, Sparrm. (type). 4. maximus, Gm. 



2. giganteus, M'Clell. 5. macrurus, Penn. 



3. indicus, Erxl. 



B. Head broad and short, depressed ; tail broad, not distichous, but 

 bushy {en panache), shorter than body and head. Incisors broad, 

 rounded, finely grooved lengthwise on their front face. Molars f . Of 

 large or medium size. — Subgenus Eeithrosciurus, Gray, 1867. 



Two Malasian species : 

 1. macrotis, Gray (type). 2. miGrotis, Jentink. 



C Head rounded, with the facial region more compressed, the inter- 

 orbital region less contracted ? [le chanfrein moins husque) than in the 

 preceding 5 tail terete or scarcely distichous, about as long as the body. 

 Molars f. Of medium size. — Subgenus Heterosciurus, Trt., 1880. 



Of Asia and Malasia : 



1. erytlirceus, Pall., ferrugineus F. Cuv. 10. modestus, Miill. & Schleg. 



(type). 11. diar(?i (Temm. ), Jentink. 



2. Mppurus, Is. Geoffr. 12. chinensis, Gray. 



3. prevosii, Desm. 13. tenuis, Horsf. 



4. lokrioides, Hodgs. 14. pMUppinensis, Waterh. 



5. loTcridh, Hodgs. 15. steeri, Giinth. 



6. leucomus, Miill. 16. rosenibergi, Jentink. 



7. alstoni, Anders. 17. murinus, Miill. & Sclileg. 



8. pernyi, A. Milne-Edw. 18. lis, Temm. « 



9. rufigemjs, Blanf. 



D, Head short, rounded, with compressed interorbital region ? {h chan- 

 frein husque), the muzzle attenuated ; tail rounded, cylindric, shorter 

 than the body. Molars f . Size very small. — Subgenus i^ANNOSCiURUS, 

 Trt., 1880. 



Of Malasia : 



1. melanoHs, Miill. & Sclileg. (tsT^e). 2. exilis, Miill. & Sclileg. 



E. Head lengthened, with narrowly-compressed muzzle; tail as long 

 as or shorter than the body, cylindric. Molars |, the first upper pre- 

 molar well developed. Pelage recalling Tamias in coloration, with dark 



* Note. — The tail is measured without the terminal pencil of hairs which projects 

 beyond? the end of the vertebrse. 



