^76 NORTH AMEEICAi>f FAUNA. ^o. 3g. , 



Geographic range. — Known only from type locality. 



General characters. — Size, smallest of the genus; feet and hands 

 small; in superficial appearance much like S. I. occultusj but smaller 

 and darker; skull smaller than that of occultus, flatter, and with 

 relatively shorter rostrum; premolars f. 



Color. — Type: Upperparts between fuscous and fuscous-black; 

 underparts hair-brown to fuscous. 



Slcull. — Smallest of the genus; in general appearance and propor- 

 tions similar to that of S. I. occultus, but smaller, flatter, and with 

 relatively shorter rostrum; each of the parietals of occultus has a 

 small posterior projection, extending between the interparietal and 

 the mastoid, which is not present on the parietals of the type of 

 anthonyi; premolars, f . 



Measurements. — ^Type (adult male): Total length, 135; tail verte- 

 brae, 26; hind foot (measured by the writer from relaxed foot of dry 

 skin), 17. SliuU: Type (adult male): Greatest length, 30.1; palatilar 

 length, 12; mastoidal breadth, 16.2; interorbital breadth, 7; maxil- 

 lary tooth row, 9.3; mandibular molar-premolar row, 9. 



ReTYiarTcs. — ^As previous descriptions of the type and only-known 

 specimen of anthonyi have been somewhat inaccurate, particular 

 care has been taken in the present description and measurements. 

 Allen 1 gave the breadth of the interorbital constriction as 7.6 

 mm., an error probably due to inaccurate measuring instruments. 

 Allen (loc. cit.) claimed that the fourth premolar on one side was 

 wanting and on the other was rudimentary; True ^ in a footnote states 

 that he finds '^only three premolars on either side," but elsewhere 

 (loc. cit., p. 51) gives the premolar formula as f . As a matter of 

 fact, the premolar formula is f; True has correctly indicated this in 

 his sketch (loc. cit., pi. 3, fig. 6) of the mandible. It is not the fourth 

 premolar that is lacking, but either the first or second, probably the 

 first. It seems possible that the dentition of the type is abnormal; 

 however, the reduction of the premolars by one occurs uniformly in 

 each tooth row. It will be impossible to know the exact status of 

 the form until more specimens are available from the region of the 

 type locality. Full specific rank is here given the form because of the 

 absence of evidence showing intergradation with the nearest geo- 

 graphic neighbor, S. I. occultus. The type of anthonyi is a fully adult 

 male, and if it represents an average specimen of the form, its size 

 and color alone are suflicient characters by which to separate it from 

 occultus. 



Specimen examined. — One, the type. 



1 AUen, J. A., Bui. Amer. Mus. Nat. Hist., vol. 5, p. 200, 1893. 



2 True, F. W., Proc. U. S. Nat. Mus., vol. 19, p. 53, 1896. 



