SQUIRRELS OF MEXICO AND CENTRAL AMERICA 59 



Cranial characters. — Premolars f . Skull similar to that of S. 

 aureogaster., but averaging smaller ; jugal slenderer ; upper molar series 

 a little narrower and lighter. Four adult skulls from the type locality 

 average: basal length 49 ; palatal length 25.6; interorbital breadth 

 18.4; zygomatic breadth 32.6; length of upper molar series 11. 



General notes. — Specimens from Ixtapa and Las Palmas near the 

 Bay of Banderas are intermediate between the San Bias Squirrel and 

 6*. c. nuchalis. Specimens from Acaponeta near the northern border 

 of Tepic are yellower than those from San Bias, thus inclining toward 

 the yellow backed 6". sinaloensis of Mazatlan. The latter may prove 

 a subspecies of colliici notwithstanding its striking difference in gen- 

 eral appearance. 



This species was named in honor of Dr. C. Collie, Surgeon of 

 H.M.S. ' Blossom,' who collected the type during the ship's visit to 

 San Bias in the winter of 1S2S. 



Sfecimens examined. — Twenty-four : from San Bias, Santiago, 

 and Acaponeta, Tepic. 



SCIURUS COLLL^I NUCHALIS subsp. nov. 

 Manzanillo Squirrel. 



Type from Alanzanillo, Colima, Mexico. Type no. |||^^ $ ad., 

 U. S. Nat. Museum, Biological Survey Collection. Collected Feb. 

 2, 1S92, by E. W. Nelson. 



Distribution. — Arid tropical lowlands from the border of Michoa- 

 can north along the coast to the Bay of Banderas, Jalisco, and inland 

 to the more heavily wooded mountains near San Sebastian, Jalisco 

 (below 3000 feet). 



Characters. — Differs from true colliceixn its rusty rufous ears, buffy 

 yellow suffusion on nape and shoulders and heavy wash of black on 

 lumbar area and rump. Pelage rather thin ; hairs of back coarse, 

 stiff and shining : Teats : p. i a. |- i. \. 



Description of type. — Winter pelage : Upperparts, including 

 crown and base of tail, buffy yellowish or yellowish gray, grizzled 

 with black on crown and nape and heavily washed over lumbar re- 

 gion and rump with shining black; the yellow more rusty on nape 

 and more buffy posteriorly ; flanks paler than back ; ears rusty rufous, 

 with small basal patches of rusty or rusty whitish ; sides of nose and 

 cheeks dingy yellowish brown ; ring around eye paler yellowish ; feet 

 and outside of legs iron gray, with wash of gray on fore shoulders; 

 underparts white, tail, above black rather thinly washed with white; 



