THE OSPREY. 105 



Remarhs: This fine and well inarkccl race from its almost isolated range 

 shows Imt little intergradation witii other representatives of this genus, except 

 whore its range joins that of /'. c. canad<'7i!<is along the 50° parallel, though 

 examples from the Black Hills, South Dakota, show slight intergradation in 

 color, hut not in size. 



Perisoreus canadensis obscuuus Kidgw. 

 Oregon Canada Jay. 

 Tlahilat: Pacific slopes of the Sierra Nevada and Cascades ranges north 

 of the 40° parallel to the 50° parallel. 



Remarlfs: This also well marked and nearly isolated race intergrades 

 markedly only where its range joins that of P. c. can adenms fit the 50° parallel. 

 Mr. Ridgway in his original description makes ohsoa-us, 1 think rightly, a 

 race of P. c. canadensis with which it certainly intergrades, and not a separate 

 species as Sharpe, in 1S77, recognized it in the British Museum catalogue. 



Pekisoeeus canadensis fumifkons Ridgw. 

 Northern Canada Jay. 



Synonym: P. c. nigricapillus Ridgw. Pr. U. S. Nat. Mus. V, Juno 5, 

 1882, p. 15. 



ITahitat: Northern North America, approximately north of the 50° 

 parallel east of the 97° meridian, and north of the 60° parallel west of the 97° 

 meridian. 



Eeraarhs: An unlahelled series of specimens from Labrador and Alaska 

 it is impossible for me to separate correctly into the two races fmiiifrmis and 

 nigricapilht.'i, and after careful study and comparison I am absolutely unable 

 to discover any stable character, even of color, to separate these races. A 

 large number of measurements shows ihaXfiirivifrfmsaverafjes slightly smaller 

 than nigricajnUus, but this difference is not constant. In my opinion the 

 bird that extends across the hemisphere parallel with the timber and isothermal 

 lines must be known by one name, fmrdfrons, unfortunately from priority. 

 Mr. Joseph Grinnell has suggested the approach oi fumif vans io nigrwajyil Ins, 

 and a range extending across northern North America can be paralleled by 

 the range of the Spruce Grouse ( Canachltes canadensis) and other species. 



Key. 



Measurements given in millimeters. 

 P. infamtiis: Wing coverts and outer tail feathers, rufous. Wings, S 

 144, 9 137-148. 



P, c. canadensis: Brownish-gray predominating. Eye partly, some- 



