BLUE HAWK, OR HEN-HARRIER. 
31 
Circus gallinarius, Vieill. Nouv. Diet. d'Hist. Nat. IY, p. 459. Circus cyaneus, 
Id. XXXI, p. 410. 
Circus cyaneus, Boie. Circus ranivorus, Vieill. Nouv. Diet. d?Hist. Nat. IV, p. 
456, young, African. 
Falco strigiceps, Nills. Orn. Suec. I, p. 21. 
Falco torquatus, Briss. Orn. I, p. 345, Sp. 7. Id. 8vo. p. 100, Male and Female, 
Brunn. Sp. 14. 
Falco montanus cinereus, Briss. Orn. I, p. 355, Sp. 9, Var. A. Id. 8vo. p. 112, 
adolescent Male. 
Accipiter Freti Hudsonis, Briss. Om. VI, App. p. 18, Sp. 47. 
Lanarius cinereus, Briss. Orn. I, p. 365, Sp. 17. Id. 8vo. p. 106. 
Lanarius albicans, Briss. I, p. 367, Sp. 18. 
Subbuteo, Gessner, Av. p. 48. 
Pygargus accipiter, Ray, Syn. p. 17, Sp. 5. Will. Orn. p. 40, PI. 7. 
Falco plumbeus, cauda tesselata, Klein, Av. p. 52, Sp. 22. 
Lanarius , Aldr. Orn. I, PI. 381, 382, adult Male. 
Lanarius cinereus , sive Falco cinereo-albus, Frisch, PI. 79, 80, adult Male. 
Falco montanus secundus, Aldr. Will. PI. 9, adult Male. 
Albanella, Storia degli Ucc. I, PI. 35, adult Male. 
Falco Pygargo, Id. I, PI. 31, Female. 
Autre Oiseau St. Martin, Belon, Hist. Ois. p. 104. 
LWiseau St. Martin, Buff. Ois. I, p. 212. Id. PI. enl. 459, adult Male. Gerardin, 
Tabl. Elem. Orn. I, p. 43. 
La Soubuse, Buff. Ois. I, p. 215, PI. 9. Id. PI. enl. 443, young Female, 480, young 
Male. Gerardin, Tabl. Elem. Om. I, p. 37, Female and young. 
Le Grenouillard, Le Vaill. Ois. Afrique I, p. 63, PI. 23, young. 
Kore oder Halbweyhe, Bechst. Tascb. Heutsch. p. 25, Sp. 20. Meyer ^ Wolf, Ois. 
d'AUem. liv. 27, PI. 5, adult Male, PI. 6, Female. Naumann, Vog. Heutsch. ed. 2. 
I, PI. 39, fig. 1, adult Male, fig. 2, adult Female, PI. 38, fig. 2, young Male. 
Mause Habicht, Missilauche, Meyer, Boehm. Abh. 6, p. 313, adult Male. 
Blue-Hawk, Edw. V, p. 33, PI. 225, adult Male. 
Marsh-Hawk, Edw. p. 173, PI. 291. Penn. Bret. Zool. Sp. 105. Lath. Syn. I, p. 90, 
Sp. 75, Var. A. Female and young. 
Ash-coloured mountain Falcon, Lath. Syn. I, p. 94, Sp. 78. Var. A. adolescent Male. 
Hen-Harrier , Edw. PL 225, very old Male. Will. (Angl.) p. 172. Alb. II, PI. 5. 
Hayes, Brit. Birds, PI. 1. Lewin, Brit. Birds, I, p. 18. Penn. Brit. Zool. I, Sp. 58, 
p. 28. Lath. Syn. I, p. 88, Sp. 74. Id. Suppl. p. 22, adult Male. 
Ring-tail Hawk, Edw. Ill, pi. 107. Penn. Arct. Zool. Sp. 106, Female and young. 
