SCIURIM3— SCIURUS IIYPOrYRRIIUS. 



749 



known species, the tail being about three inches longer than the body, — a 

 proportion found in no other Mexican Squirrel. The general size, as well as 

 the narrowness of the tail, gives further evidence of its correct reference 

 being here. There are, furthermore, two specimens in the collection that 

 agree fully with Bennett's description, which I have no hesitation in referring 

 to this species. 



The Sciurus variegatoides of Ogilby and the Sciurus griseocaudatus of 

 Gray, from the "west coast of South America", I am convinced are both 

 referable to this species, and hence also Gray's "var. 1" of Gray's Macroxus 

 collicei. They agree closely with the specimens from Panama and La Union. 



The Sciurus varius and S. socialis of Wagner were referred by Wiegmann 

 to this species, as I think, incorrectly. The former seems to more nearly 

 agree with S. boothia, while the latter I am unable to identify. 



This seems to be a common species in Southern Mexico and Central 

 America southward to Ecuador, and presents, as noted above, widely varying 

 phases of coloration. 



In several specimens of this species, in which the dentition could be 

 examined, there were generally found two upper premolars, but two out of 

 four alcoholic examples had only one. 



Table XLV. — Measurements of eleven specimens of Sciurus hypopyrrhus. 



Locality. 



I 



9392 

 9393 

 9014 

 7019 

 8495 

 6628 

 7205 

 '4260 

 3640 

 3045 

 3043 



Guayaquil, Ecuador 



do 



do 



La Union, Central America . 



Nicaragua 



San Jos6, Co8ta Rica 



Goazaeoalcos, Moxico 



Mexico (Gulf coast) 



Obispo, Panama 



.do . 



.do . 



From tip of nose to- 



« 



1.10 

 0.93 

 1.10 

 1.18 

 1.13 



1.00 

 1.20 

 1.05 

 0.95 

 1.13 



H 



2.00 

 1.80 

 1.98 

 1.98 

 2.20 



2.10 

 2.20 

 2.00 

 1.90 

 2.07 



2.42 

 2.38 

 2.52 



2.45 

 3.65 

 2.57 

 2.45 



2.47 



12.50 

 12.25 

 12.50 

 12.25 

 12.00 

 9.00 

 13.00 

 11.25 

 10.40 

 10.25 

 10.25 



Tail to end of- 



12.00 

 13.75 

 11.00 

 12.25 

 11.00 

 9.75 



11.25 

 10.40 

 10. 00 

 10.35 



w 



14. 25 

 16.25 

 13.50 

 15.20 

 13.75 

 12.00 



12.65 

 12.85 



12. tiO 



Length of- 



1.50 

 1.50 

 1.45 

 1.55 

 1.75 

 1.35 

 1.45 

 1.55 

 1.65 

 1.55 

 1.65 



w 



2.30 

 2.35 

 2.35 

 2.40 

 2.55 

 2.25 

 2.45 

 2.40 

 2.50 

 2.43 

 2.47 



w 



0.85 

 1.00 

 0.80 

 0.76 

 0.70 

 0.75 

 0.78 

 0.80 

 0.90 

 0.95 

 0.95 



fe 



Skin. 



...do. 



...do. 



...do. 



...do. 



...do. 

 ....do. 

 Alcoholic. 



...do. 



...do. 



...do. 



' In Museum of Comparative Zoology, Cambridge, Mass. 



