1893.] Zoology. 833 
and body), clothed with minute, whitish hairs, slightly darker along 
ridge, the annuli not concealed thereby. There is no dark ring around 
eyes. Upper parts uniformly buffy gray, lacking any tendency to a 
darker median area, the lower sides and cheeks becoming purer och- 
raceous buff, the root of the tail being encircled by same color. The 
face is grayer than rest of upper parts. Pelage very soft, long and 
full. Feet white, small and slender, upper half of thighs and fore-legs, 
buff Lower parts soiled gray washed with buff, whitest on chin, dark- 
est on breast and belly. 
Measurements.— Total length, 200 ; tail, 115 ; hind foot, 21. Skull 
—total length, 24.5 ; basilar length, 18.5; zygomatic breadth, 12.3 ; 
length of nasals, 9.2 ; interorbital construction, 3.5 
This species is represented by four specimens, all taken in March, 
April, and June, on the ranch of the gentleman whose name they bear. 
They belong to the long-and-naked-tailed, large-eared group of 
Sitomys typified by eremicus. In colors and general proportions the 
nearest ally of herronii is probably the S. rowley? of Dr. Allen, from 
Utah. It differs therefrom according to Dr. Allen, “ in slenderer feet, 
buffy white instead of pure white underparts, rather grayer head and 
naked, instead of hairy, tail." Herronii also differs markedly from row- 
leyi in its skull measurements when compared with those given for the 
latter species by Dr. Allen. The length of nasals, given as “5.5” for 
rowleyi,is probably a typographical error. I have seen no skull of 
Sitomys in which the nasals measure less than seven millimeters, and, 
to judge by its other dimensions, rowleyi must be a large species. In 
its average characters herronii comes most closely to Sitomys eremieus 
and its sub-species fraterculus from both of which it may readily be 
distinguished by its buffy tints and larger size. Cranially, it has a 
broader and flatter rostrum, less recurved upper incisors and relatively 
much longer and wider incisive foramina than eremicus. There is no 
decided variation in size and color among the Aerronii series in my 
possession, the type being a fair average of the lot. 
9. Onychomys ramona? Sp. nov. (Type No. 823, 9 , Col. S. N. Rhoads, 
San Bernardino Valley, Cal, April 11, 1893, col. by R. B. Herron). 
Description.—Size somewhat larger than O. torridus, with larger 
ears. Colors similar to O. longicauda, but with an appreciable dorsal 
stripe and shorter, stout tail. Skull averaging larger or as large as O. 
3 Bull. Am. Mus. Nat. Hist., V, 76. 
t Mr. Miller, who describes fratercu/us as a full species, now considers it a “ dark 
coast form of eremicus.” 
5 For ** Ramona,” ** H. H." Jackson's heroine of the San Bernardino Valley. 
56 
