52 FALCONID^. 



«'". Head uniform dark brown, with 



slight fulvous strealjs qouUli, p. 72. 



d". Outer tail-feather always distinctly 



barred below. 



e". Quills uniform below, light-coloured 



at base of inner web, but not 



barred. 



e"". Upper tail-coverts white, with 



narrow brown centres cyaneus, p. 52. 



/"". Upper tail-coverts brown, tipped 



with white assimilis, p. 63. 



f". Quills ban-ed below. 

 ff"". Underwing-covertsbuff or tawny 

 with brown streaks. 

 aa. Interspaces of quills and tail- 

 feathers below white, the 

 black bars contrasting strongly maiirus, p. 60. 

 bh. Interspaces below fulvous, with 

 brown cross bars. 



aa'. Breast uniform tawny hudsonius, p. 55. 



bh'. Breast fulvous, with brown 

 streaks. 

 aa". Larger ; wing 13'5-15 . , cyaneus, p. 52. 

 hh". Smaller; wing 12'2 .... cmer«<.s, p. 56. 

 h' ' ' '. Under wing-coverts black .... mactdosus, p. 62. 

 b. Outer edge of fifth primary entire. 



a'. Notch in second primary an inch or more 



distant from the coverts pygargris, p. 64. 



' b'. Notch in second primary nearly or quite 



hidden by the coverts macrurus, p. 67. 



1. Circus cyaneus. 



The Blue Hawk, Edw. Glean, i. p. 33, pi. 225 (1758). 



Le Faucon a collier ( $), Brias. Orn. i. p. 345 (1760). 



Le Faucon de Montague cendrt?, Briss. Orn. i. p. 355 (1760). 



Falco cyaneus, Linn. >S. N. i. p. 126 (1766, ex Edin.) ; Montaq. Trans. 



Linn. Soc. ix. p. 182 (1808) ; Temm. Man. d^Orn. i. p. 72 (1820) ; 



Wei-ner, Atlas, Bapaces, pi. 28 (1827) ; Schl. ^- Susetn. Viig. Eur. 



Taf. 37 (1839) ; Nordm. in Demid. Voy. Buss. Mir. iii. p. 107 (1840); 



Yarr. Brit. B. i. p. 94 (1843). 

 Soubuse, Buff. PL Enl. i. pis. 443, 480 (1783). 

 Oiseau St. Martin, Buff. PI. Enl. i. pi. 459 (1783). 

 Falco griseus, Gm. S. N. i. p. 275 (1788, e.r Lath.). 

 Circus gallinarius, Savign. Ois. d'Egypte, p. 264 (1810) ; Less. Traiti, 



p. 84 (1831). 

 Accipiter variabilis. Pall. Zoogr. Bosso-As. i. p. 364 (1811). 

 Circus variegatus, Vieill. JV. Diet. iv. p. 466 ( 1816). 

 Pygargus dispar, Koch, Syst. Baier. Zool. p. 127 (1816). 

 Circus segithus. Leach, Syst. Cat. Mamm. Sfc. Brit. Mus. pp. 9, 10 



(1816). 

 Falco strigiceps, Nilss. Orn. Suec. i. p. 21 (1817). 

 Falco pygargus, Naum. Vog. Deutschl. i. p. 391, pi. 38. figs. 2, 39 



(1822). 

 Circus cyaneus, -Bote, Isis, 1822, p. 549 ; Selby, Brit. B. i. p. 68, pi. x. 



(1833) ; Gould, B. Eur. i. pi. 33 (1837) ; Macgill, Hist. Brit. B. iii. 



p. 366 (1840) ; Gray, Gen. B. i. p. 32, pi. 11. fig. 1 (1845) ; Schl. 



