720 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Alauda, i, 1929, 41 (Vitry, France). — Reboussin, L'Oiseaux, x, 1929, 467 

 (Loir-et-Cher, France). — Schenk, Aquila, xxxiv-xxxv, 1929, 90, in table 

 (HungarjO- — Bannerman, Birds Tropical West Africa, i, 1930, 211 (descr. ; 

 habits, West Africa). — Hesse, Anz. Orn. Ges. Bay., ii, 1930, 71 (obs., Brand- 

 enburg distr., Germany). — Meinertzhagen, in Nicoll's Birds Egypt, ii, 

 1930, 379 (descr.; habits; Egypt). — Rocard, L'Oiseaux, xi, 1930, 214 (Noir- 

 moutier Island, France). — Schiermann, Journ. fiir Orn., Ixxviii, 1930, 150 

 (population density in breeding season). — American Ornithologists' 

 Union, Check-list, ed. 4, 1931, 77 (accid.. North America). — Jouard, 

 Alauda, iii, 1931, 428 (e. Pyrenees). — Olivier, L'Oiseaux, new ser., i, 1931, 

 G65 (Pyrenees, France).— Peters, Check-list Birds of World, i., 1931, 298.— 

 VAN Dobbin and Makkink, Ardea, xx, 1931, 38 (migr. ; Holland). — Cha- 

 viGNT and Mayaud, Alauda, iv, 1932, 432 (Azores Islands). — Glegg, 

 L'Oiseaux, new ser., ii, 1932, 304 (Camargue, France). — Groebbels, Mob- 

 bert, and Timmermann, Verh. Orn. Ges. Bay., xix, 1932, 544 (breeding 

 habits, Hamburg, Germany). — Labitte, L'Oiseaux, new ser., ii, 1932, 373 

 (breeding habits; France). — Ticehurst, Birds Suffolk, 1932, 240 (stat.; 

 habits; Suffolk, England). — Anonymous, Brit. Birds, xxvii, 1934, 245; 

 xxviii, 1935, 261 ;xxix, 1935, 55;xxx, 1937,'258;'xxxi, 1938, 307; xxxii, 1939, 335; 

 xxxiii, 1939, 134; xxxiv, 1940, 39; xxxv, 1941, 152; xxxviii, 1944, 29; 1945, 

 349; xxxix, 1946, 366 (marked birds; recoveries; British Isles). — Parsons, 

 Brit. Birds, xxix, 1935, 28 (food).— Gooch, Brit. Birds, xxix, 1936, 246 (eat- 

 ing prey in air; 1 at Dartmore; 1 in North Africa). — Lewis, Brit. Birds, 

 XXX, 1936, 221 (Island of Steep Holm; 2 pairs res.). — Lockley, Brit. Birds, 

 xxix, 1936, 233 (Skokholm Island, Pembrokeshire). — Macpherson, Brit. 

 Birds, XXX, 1937, 367; xxxi, 1938, 373 (London).— White, Brit. Birds, xxxi, 



1937, 232 (outer Hebrides).— Jo crdain, in Bent, U. S. Nat. Mus. Bull. 170, 



1938, 99 (life hist.).— Harthan, Brit. Birds, xxxii, 1939, 398 (attacking 

 gray squirrel). — Nethersole-Thompson, Brit. Birds, xxxii, 1939, 259 

 (enemy of red grouse). — Owen, Brit. Birds, xxxiv, 1940, 21 (England, near 

 Oswestry). — Christison, Ibis, 1941, 548 (Baluchistan, Chagai district; 

 abund.; 1 nest recorded). — Glegg, Ibis, 1941, 580 (L'Jle de la Camargue et 

 la Petite Camargue, France; 1 banded in the Camargue June 7, 1936; secured 

 at Chandes-Aigues on Sept. 19, 1937). — Fitter and Roberts, Brit. Birds, 

 xxxv, 1942, 259 (Inner London). — Crooks, Brit. Birds, xxxvii, 1943, 37 

 (fatality to pair of kestrels). — Hoshing, Brit. Birds, xxxvii, 1943, 7 (carrying 

 food in left foot).— Low, Brit. Birds, xxxvi, 1943, 191; xxxvii, 1944, 225; 

 xxxviii, 1945, 310 (Inner London). — Staton, Brit. Birds, xxxvi, 1943, 245 

 (following plow). — Boyd, Brit. Birds, xxxviii, 1944, 15 (attacked by gulls). — 

 Ludlow, Ibis, 1944, 374 (se. Tibet; 1 at Rungzung, Mar. 7; 1 at Lhahing, 

 Apr. 29). — RuTLEDGB, Brit. Birds, xxxviii, 1944, 33 (Galway and Mayo). — 

 Benson, Ibis, 1945, 385 (s. Abj'ssinia; 2 in Nov. 1941 near Yavello; 1 Dec. 

 29, 1940, near Burgi). — Lack, Ibis, 1945, 322. — Parrindon, Brit. Birds, 

 xxxviii, 1945, 364 (North Cornwall; predators on stonechats). — Southern 

 and Tucker, Brit. Birds, xxxviii, 1945, 186 (Lundy, in 1942). — W^illiam- 

 soN, Ibis, 1945, 28 (Faeroe Islands; 1 flew in open door at Tdrshavn, Sept. 

 14, 1943; rare). — Coltart, Brit. Birds, xxxix, 1946, 121 (capturing a bird 

 in full flight) .—Ellis, Brit. Birds, xxxix, 1946, 113 (food).— Griffith, 

 Brit. Birds, xxxix, 1946, 376 (male passing prey to female w^hile in air). — 

 Hartley, Ibis, 1946, 241 (Palestine; 2 pairs nested in May 1944). — Haver- 

 schmidt, Brit. Birds, xxxix, 1946, 336 (laying in basket placed in trees). — 

 Holroyde, Brit. Birds, xxxix, 1946, 282 (catching redwing). — Low and van 

 Oostveen, Brit. Birds, xxxix, 1946, 169 (Inner London). — Roberts, Brit. 



