SQUIRRELS OF MEXICO AND CENTRAL AMERICA 59 



Cranial characters. — Premolars \. 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 fiotes. — Specimens from Ixtapa and Las Palmas near the 

 Bay of Banderas are intermediate between the San Bias Squirrel and 

 S. c. nuchalis. Specimens from Acaponeta near the northern border 

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

 the yellow backed S. sinaloensis of Mazatlan. The latter may prove 

 a subspecies of collicvi notwithstanding its striking difference in gen- 

 eral appearance. 



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

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

 San Bias in the winter of 182S. 



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

 and Acaponeta, Tepic. 



SCIURUS COLLI^I NUCHALIS subsp. nov. 

 Manzanillo Squirrel. 



Type from Manzanillo, Colima, Mexico. Type no. ffff| $ ad., 

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

 2, 1892, by E. W. Nelson. 



Distribution.— Kx\(k 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.— Vf\^&x% from true collicei'm 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 /y/d?.— 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; 



