1111 FALCONS, HAWKS, 11.1111 11s, 1111'. 
     
    
   
   
    
     Buck fuseous, f‘ourth primary longest, outer t11i1~f~11t11ers half 1111 
     
     ineh or more shorter than the middle ones; wing over 9'00. 
     
     338. (1111111151115 IIAWK. 
     
     I). \Ving over 1000. 
     
     111. Seeond primarv 10114 t. t11i1 generullv 0\ er 9' 00. 
     
     I: ‘ 1 o“ 111 t11il— —1-11\'e1 s1111111111- -11111t11 we.hit ‘ ” 3523 WHITE GYRFALCO)‘. 
     
     3. “ Lowur tail—eeverts always more or less marked with dusky.” 
     
     354. (1111\1' Griu'ALeux 11nd Races. 
     
     (‘11 Second primary longest. tuil under 9'00. 
     
     1". Tursus shorter than middle toe without 111111, upper parts l1lackish. 
     
     81311.1)1e11HAWK. 
     
     1'5. Tursus longer than middle toe without 1111il, upper parts 
     
     23515. PRAIRIE FALCON. 
     
    
   
   
    
       
     
    
   
   
    
     brownish . . 
     
     (11. Third or fourth primary longest. 
     
     11’. Upper tail—em'erts White. . . . . . . 331. \Lmsn HAWK. 
     
     [3. Upper tail—em‘erts brownish . . .33 Au. (10511A1\'K(lm). 
     
     11’. Outer primary generally one color, base sometimes \\ hitish or with 
     
     11. tew imperfect 11111s 
     
     a. Tursus entirel) 111110, scales on its front larvre, munded. 
     
     3112. 111111 BON s CARACARA. 
     
     b. ansus entirely feathered . . . . 348. FERRI‘GINOUS ROUGH-LEG. 
     
     c. Tursus partly feathered, scales on its front small, rounded. 
     
     364. AM. ()SPREY. 
     
     d. ansus partly feathered, scales on its front transverse, more or less 
     
    
   
   
    
       
     
    
   
   
    
     square. 
     
     (11. Three outer prinmries emarginute or “ notched. 
     
     ([7. Wing un11e1'12'00 . . . . 343.11110111—11'nnm1 HAWK (1111.) 
     
     ([3. Wing over 1200. . . . . . 242. S“ .\1\'se.\ s IL\“K (1111). 
     
     51. Four outer primaries emarginute or " notehed.” 1' 
     
     Upper tail—em'erts pure white . . . . . 331. MARSH Il;\\\'K. 
     
    
   
   
    
     63. Upper tail—eoverts not pure white; Wing under 18'50; lesser 
     
     Wing—coverts conspicuously margined with rut'ous. 
     
     339. RED—SHOULDERED HAWK (1111.). 
     
     64. Upper tail»e11verts not pure White; wingover13'50, lesser wing— 
     
     eoverts not eonspieuously margined with rut‘ous. 
     
     337. {lab—mum) IlAWK AND RACES. 
     
     2. Feathers of under parts with more or less numerous 
     
    
   
   
    
     cross-bars. 
     
    

    
     A. Smiles 1111 front of the tarsus 1111111ero11s, r1111111led. 
     
     11. \Villfr under 113110. . . . . . . . . . . . 3’16 DI'K‘K H \WK. 
     
     1). \\1111r11\ er 171011 . . . . . . . 3V2. human 5 CAR“ ARA. 
     
    
   
   
    
     11’. Smiles on hem of the tmsus s1111rpl\ defined. trunsulhc, more 01 less 
     
     square. 
     
     (1.. Four or five outer prinmries enmruinnte or “ notel1e1l.”1 
     
     11‘. Tail White at the base 111111 tipped with whitish. 
     
     330. EVEHGLAIH-Z K1111. 
     
    
   
   
    
       
     
    
   
   
    
     * See Fig. 7‘0. ’r See Fig. 69.