42 BANGS — TWO NEW PIKAS ee ee 
admixture of brownish-black-tipped hairs, and shading on under parts to strong 
buff. No. 2694 is grizzled grayish brown on top of head and on lower back, 
shaded with buff and buff-yellow on neck, cheeks, lower sides and under side 
of neck; belly and chin buffy white. Between these two extremes of coloring 
every possible intermediate can be found in the large series of topotypes. 
Measurements.— Type, & adult: total length, 182.; hind foot, 30. mm. 
No. 2694, @ adult, topotype: total length, 193.; hind foot, 30.5 mm. Largest 
individual in the series, no. 2688, & adult, topotype: total length, 20r.; hind 
foot, 28.5 mm.? 
Skull, old adult, no. 209, coll. of Museum of Comparative Zodlogy: basal 
length, 40.6; occipitonasal length, 46.; zygomatic width, 23.4; width across 
audital openings, 23.2; interorbital width, 6.2; length of nasals, 16.4; width 
of nasals, 5.8 mm.” 
Remarks.— J have no specimens from very near the type locality 
of O. princeps, but the Mt. Inglesmaldie examples, referred to 
above, are wholly different from the Colorado animal. Besides 
the great differences in color, these two forms show strong cranial 
characters by which they can be distinguished. The skull of the 
Mt. Inglesmaldie form, besides being much smaller, differs from 
that of O. saxatiis in having a short, pointed rostrum, short 
nasals, which are flattened on top, deeper interorbital constriction, 
and shorter, wider palatal fossa. 
A full account of the type series of O. saxati/is can be found in 
Dr. Allen’s Monograph, together with long lists of measurements, 
on pages 407-411. 
1 For further measurements, see Dr. Allen’s list of measurements for the type series, all 
taken by himself from the fresh specimens, Monog. N. Am. Rodentia, p. 411. 
2 Unfortunately, although all preserved in the collection of the Museum of Comparative 
Zoology, the skulls of the fine series of pikas taken by the Expedition were not kept in such a 
way that it is now possible to tell to which skin any particular skull belongs. 
