1894,] Zoology. 69 
2. NEOTOMA INTERMEDIA. Sp. n 
(Type, No. 1343 ad. 3 Col. S. N. "Rhoads, Dulzura, San Diego Co., 
Cal, Aug. 21, 1893, Col. by C. H. Marsh). 
Description—Size small, tail slender, short and distinctly bicolor, 
ears large. Upper parts light brownish-gray lined with black, not 
darker medially; chin, middle of breast, vent, inside of hind legs, 
lower two thirds of tail, pes and manus white; rest of under parts, 
soiled grayish buff, brownest across middle and on sides ; bases of hairs 
darkest; upper third of tail sooty blackish; soles naked, sparsely 
haired at heel. 
Measurements.—Total length 318; tail vertebra 160; hind foot 35; 
ear from crown 28 ; (average measure of 4 adults, length 310; tail 155; 
foot 34; ear 28). Skull—Basilar length 33 ; total length 42 ; greatest 
breadth 22; interorbital constriction 5.5; length of nasals 16; inter- 
parietal breadth 11.5; length 5.9; length of upper molar series 
(crown surface), 8; pterygoid fossa to incisive foramina 7.8 ; length of 
mandible to upper base of incisor 23.8 ; heiit of deed process 
from angle 13.5. 
This small, bicolor-tailed Wood Rat from southern California has 
generally been confounded with N. mexicana, but is a different animal, 
being smaller and larger eared. Its cranial differences are decided. 
Compared with mexicana these are, greater relative size of interparie- 
tal, bulging of supraoccipital posteriorly beyond the plane of the 
occipital condyles, and in the extension of the nasal postero-superior 
processes of the intermaxillary beyond the base of nasals. 
In Dr. Merriam’s figure’ and in Baird’s description, these processes 
terminate opposite the base of nasals, barely reaching the anterior 
plane of the orbits. i 
The mandible of intermedius is much slenderer and the condyle 
more prolonged posteriorly, the tip of the latter reaching front of the 
articular surface of the former. 
Seven specimens of this species are in the collection, and I am indebt- 
ed to Mr. G. S. Miller, Jr., for the loan of others. Mr. Oldfield 
Thomas described’ a rat, N. macrotis, from San Diego, which, so far as 
the description goes, must be superficially very like intermedius, but it 
is much larger than any in my series, two of which come from the same 
locality. The skull measurements of macrotis are so applicable to 
those of fuscipes as contrasted with those of intermedius, and the col- 
ors of the feet and tail in fuscipes sufficiently variable to make it pos- 
N. Am. Fauna, No.3, Pl. X. N. pinetorum, Proc. Biol. Soc. Wash., 1893, p. 111. 
2Am. Mag. N. Hist., Sept. 1893, 234. 
