Page 1 8, 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 ^ 370-375, ^ 4^5-435 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 percontator Cabot, Boston Mexico and Yucatan, 



Jnl. N.H., vol. 4, p. 462 (1844). [Chicken Itza, S. to Central America 



Yucatan.] and Northern 



Mexican Harrier-Hawk. S. America. 



Larger ; wing (J 260-278, ^ 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, ^ 171 Tarn. ; above like C. guerilla 

 guerilla {(^ blackish slate, wings browner ; ^ 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 tachiro aceletus Oberholser, Pr. U.S.N. Mus., 

 xxviii., p. 829 (1905). [Taveta, B.E.A., type in 



U.S.N. Mus.] 



After this article add : 



66dd. Astur tachiro orienticola Oberholser, Ann. Carnegie Mombasa, B.E.A. 

 Mus., iii., p. 495 (1906). [Mombasa, type in Carnegie 

 Mus., Pittsburgh.] 



Small pale form ; wing ^ 198 mm. 



