1915.] Allen, Review of the South American Sciuride. 243 
their ranges are separated by that of the intervening form milleri, which in 
some respects is quite different from either gerrardi or versicolor. Thomas, 
in describing versicolor, took an Ecuador specimen for the type, but referred 
to this form nearly all of the Colombia specimens in the British Museum 
which I have referred above to gerrardi. On finding it necessary to take the 
name gerrardi, on the ground of its priority over versicolor, I at first presumed 
that versicolor would lapse into synonymy, but in working out the group it 
became evident that versicolor could be accepted for the most southern 
of the known forms of the gerrardi group. A specimen in the American 
Museum from Esmeraldas is almost an exact counterpart of the type of 
versicolor, while another specimen from the same locality is like average 
specimens from the Chocé of Colombia, except that it has a much larger area 
of black at the tip of the tail than is often met with in true gerrardt. 
Mesosciurus gerrardi morulus (Bangs). 
Text Fig. 14, showing mamme (p. 165).. 
Sciurus variabilis morulus Banes, Proc. New England Zoél. Club, II, p. 48, 
Sept. 20, 1900.— Miter, Bull. 79, U.S. Nat. Mus., p. 338, 1912; Gotpman, Smiths. 
~ Misc. Coll., LX, No. 22, pp. 4, 5 (in text), Feb. 28, 1918. 
Type locality.— Loma del Leon, Panama. 
Geographic distribution.— Humid tropical lowlands of central and west- 
ern Panama. 
Description.— Upperparts varying (in different specimens from the 
same locality) from light ochraceous buff to deep ochraceous buff or even 
ochraceous orange, finely lined with dusky, the hairs individually being 
black basally, ringed near the tip with ochraceous; median dorsal area 
slightly or not distinctly darker than the sides, but showing a tendency to a 
poorly defined dusky dorsal band; underparts ochraceous rufous, usually 
uniform but varied in some specimens with small spots of white in the 
axillee, inguinal and pectoral regions, or along midline of belly; outside of 
fore limbs usually deeper ochraceous than the sides of the body or the thighs; 
inside of fore and hind limbs like the ventral surface; tail above at base 
nearly uniform with the middle of the back, or slightly darker in some 
specimens, the middle portion (about one half to two thirds of the total 
length) reddish ochraceous, with a long black tip, about equal in length to 
the dark basal portion but much blacker. 
Total length (type), 450; head and body, 235; tail vertebrae, 215; hind 
foot, 56; ear, 24. Skull, total length, 55; zygomatic breadth, 33.6; inter- 
orbital breadth, 24; nasals, 18; maxillary toothrow, 9.5. 
