FALCONID.E — THE HAWKS — CIRCUS. 



489 



Gends circus, L.uepede. 



Circus, Lacepede, Mem. dc I'liist. Fims, III. cxi. 180.3, 506. 



Gen. Char. Face partly encircled by a ruff of short projecting feathers, as in the 

 owls. Head rather large ; bill short, compressed, curved, from the base ; nostrils large ; 



C. Httdsoilius. 



wings long, pointed ; tail long ; tarsi long and slender ; toes moderate ; claws rather 

 weak. 



Circus Hudsonius, Lixx/eus. 



THE MAHSH HAWK. 



Falco Hudsonius, LlXN.Ens, Syst. Nat. I. 17Cfi, 128. — Circus Iludsoniu':, ViEir.LOT, Ois. 

 Am. Sept. pi. 9. — Cassijj, P. K. Kcp. Birds, IX. 38. — Newiii-hrv, P. R. Uop. VI. iv. 

 'i. — Baird, X. iii. 12 — Kesnerly, X. iv. 19. — ^EER^rA^■^^ X. vi. ."J.l. — Cooper 

 and Sucklev, XII. iii. Zool. of W. T. l.iO. — Coi.'ES, Pr. A. N. Sc. ISGG, 491. (Ari- 

 zona ) 



Falco ullr/iiiosus, Gmeltn, Syst. Xat. I. 1788, 278. — Wii.sox, Am. Orn. VI. G7, jd. 51, f 2. 

 — Bonaparte, Am. Orn. II. pi. 11, f. 1. (Adiilt male.) 



Fako ct/anew!, AvDVROs, Orn. Biog. IV. 396; pi. 356: Oct. cd. I. pi. 26. — Nuttull, Man. 

 I. 113 (but not the same as C. ci/nneus, of Europe). 



Sp. Cii-\r. Adult. Entire upper jiarts, head and Iireast, pale bluish-einercons. on the 

 back of head mi.xed with dark fulvous ; upper tail coverts wdiite. Beneath white, with 



62 



