ii. 
Page 18, No. 34a.—To distribution add: ‘‘ N.E. Siberia.” 
Page 20, No. 38a.—After this article add: 
38b. Circus assimilis quirindus Math., Bds. of Austr., v., Celebes. 
p- 23 (1915). [Celebes.] 
Smaller; wing g 370-375, Y 425-435 mm.; above 
bluer grey; throat and chest grey, without spots. 
Page 25, No. 49.—For distribution read: ‘‘ Brazil and Paraguay’’; and after 
No. 49a add: 
49b. Micrastur melanoleucus percontatoy Cabot, Boston Mexicoand Yucatan, 
Jnl. N.H., vol. 4, p. 462 (1844). [Chichen Itza, S.to Central America 
Yucatan.| and Northern 
Mexican Harrier-Hawk. S. America, 
Larger ; wing ¢ 260-278, Y 275-292 mm. (as against 
255-260 and 270-275 mm. in typical form) ; above 
blacker ; juvenile deeper ochraceous buff below. 
Page 27, No. 55.—For distribution read: ‘‘ Mexico to Nicaragua’’; and after 
this article insert : 
55a. Climacocercus guerilla interstes Bangs, Auk., 1907, Costa Rica, 
p. 289. [La Estrella, Cartago, Costa Rica, type in S. to Panama. 
M.C.Z., Harvard.] 
Bangs’s Harrier-Hawk. 
Wing ¢ 160-167, 9171 mm.; above like C. guerilla 
guerilla (g blackish slate, wings browner; Y back 
as well as wings chocolate brown); below closely 
barred down to under tail-coverts, while in C. guerilla 
guerilla the black bars are narrower and more widely 
spaced on centre of abdomen, the vent much whiter. 
55b. Climacocercus guerilla jugularis Gurney, List Diurn. Colombia, Venezuela 
Bds. Prey, p. 117 (1884). [Brazil, Venezuela, Brazil. 
Colombia—type loc. selected Venezuela.] 
Wing ad. 170-182 mm.; above much greyer slate ; 
below heavily barred as in interstes but the chest 
tinged with rufous. 
Page 35, No. 66d.—The following name has priority over “‘ tenebrosus "’ : 
Astur tachivo aceletus Oberholser, Pr. U.S.N. Mus., 
XXVill., p. 829 (1905). [Zaveta, B.E.A., type in 
U.S.N. Mus.] 
After this article add: 
66dd. Astur tachivo orienticola Oberholser, Ann. Carnegie Mombasa, B.E.A. 
Mus., iii., p. 495 (1906). [Mombasa, type in Carnegie 
Mus., Pittsburgh.] 
Small pale form; wing 9 198 mm. 
