102 



PROCEEDINGS OF THE ACADEMY OF 



son) ; Canada and Wisconsin (Museum Philadelphia Academy) ; 

 Massachusetts (Museum Wm. Brewster); Illinois (Ridgway) ; 

 Arkansas, Mazatlan, Costa Rica, and Argentine Republic (Na- 

 tional Museum); Guatemala (Sclater); Patagonia (Sharpe) ; 

 Masafuera (Salvin, in epist.). 



Diagnosis. Dimensions: Length, 19.00-22.00; extent, 48.00- 

 56; wing, 12.00-17.25; tail, 8.00-9.80; Culmen, .80-95; tarsus, 

 2.30-2.90; middle toe, 1.40-1.70. 1 Weight, 1^-3^ lbs. Form: 



1 These figures are based upon the following measurements made by the 

 author : 

 I. Measurements of prepared specimens. Museums. 



II. Measurements of fresh specimens in the field (in connection with the 

 duties of the Zoologist of the United States Geological Exploration of the 

 Fortieth Parallel, Clarence King, Esq., United States Geologist, in charge). 

 These measurements require explanation in order that they may be under- 

 stood. They come in the same sequence in each instance, as follows : (1) 

 Total length, from the point of the bill to the end of the tail ; (2), widest 

 expanse of the wings, from tip to tip ; (3), length of the wing from the carpal 

 joint to the point of the longest primary ; (4), length of the wing from the 

 metacarpo-phalangeal joint; (5), length of the culmen along the chord of 

 the arch ; (6), length of the tarsus in front ; (7), length of the middle toe 

 to the base of the claw ; (8), length of the tail from the base of the coccyx ; 

 (9), length of the tail from the end of the upper coverts. 



a. Summitries of field notes. %, ad. (Four specimens, Nevada and 

 Utah, coll. U. S. Geol. Expl. 40 Par.) : 19^-20; 48-50 J ; 12|; || ; If; 7| ; 

 4 ; weight H-2| lbs. Upper mand. deep black, scarcely bluish basally ; 

 lower black with basal | light blue ; cere and rictus greenish gamboge, or 

 dull light lemon-yellow ; eyebrow olivaceous ; iris deep hazel, or burnt- 

 sienna sometimes yellowish on upper portion ; tarsi and toes deep light 

 chrome-3 r ellow ; claws black. 



9 , ad. (Eight specimens, Nevada and Utah, coll. U. S. Geol. Expl. 40 

 Par.): 21-22; 50-56 ; 16^-17; 13J-14 ; 1; 2; 8|; 5; weight 2^-3^ lbs. 

 Bill slate-black, becoming light slate-blue basally ; cere and rictus light 

 gamboge, sometimes tinged with greenish ; eyebrow olivaceous-yellow ; iris 

 deep hazel ; tarsi and toes deep chrome-yellow ; claws black. 



