104 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



is representative of an unnamed subspecies. Following is a synopsis 

 of measurements of specimens in the collections of the United States 

 National Museum : 



PALCO F. FUSCO-CAERULESCENS. 



Five males (Santiago, Chile; Conchitas, Buenos Aires; Kilometer 

 182, Formosa; Tapia, Tucuman ; Paraguay) wing, 235-255.5 (245.4) ; 

 tail, 148.5-165 (156.3); culmen from cere, 14.5-16 (15.3); tarsus 

 43-45 (43.5 mm.). Three females (Chile; Conchitas, Buenos Aires; 

 Tapia, Tucuman) wing, 280-290 (285) ; tail, 181.8-183.3 (182.5) ; 

 culmen from cere, 16.9-18 (17.6) ; tarsus, 4*7.8-50.5 (49.1 mm.). 



FALCO F. SEPTENTRIONALIS. 



Nine males (Mirador, Vera Cruz; Alta Mira, Tampico; Lake 

 Palomas, Chihuahua; Hachita, and Luna County, New Mexico; 

 Fort Huachuca, Arizona), wing, 245-272.5 (259.1); tail, 146.5-187 

 (172.2) ; culmen from cere, 15.1-17.7 (16.4) ; tarsus, 43-47.5 (45.3 

 mm.). 



Four females (Mirador, Vera Cruz; Mazatlan, Sinaloa; Otero 

 County, New Mexico; Fort Huachuca, Arizona), wing, 287-298 

 (293) ; tail, 188.3-203.5 (197.1) ; culmen from cere, 18.5-19.8 (19.1) ; 

 tarsus, 46.5-53. (49.9 mm.). 



GAMPSONYX SWAINSONII SWAINSONII Vigors 



Gampsoni/x swainsonii Vigors, ZooI. .Toui-n., vol. 2, April, 1825, p. G9. 

 (Ten leagues W. S. W. of Bay of San Salvador, Bahia, Brazil.) 



A male of this beautiful little falcon was taken September 25, 

 1920, at Kilometer 200, west of Puerto Pinasco, Paraguay. The 

 bird was killed as it rested on a dead limb in iho, top of a tree that 

 stood in the border of a tract of forest. The call note of this indi- 

 vidual was a lovf kee kee. In attitude the bird resembled a sparrow 

 hawk at rest, but was distinguished by its shorter tail. 



Compared with two skins from Diamantina, Brazil, this specimen 

 differs in a broader collar of black across the hind neck. One side 

 is nearly immaculate, the other is streaked slightly with rufous. 

 Measurements are as follows: Wing, 154; tail, 92.5; culmen from 

 cere, 13; tarsus, 29.5 mm. 



Family ACCIPITRIDAE 



ELANUS LEUCURUS LEUCURUS (Vieillot) 



Milvus leucurus Vieillot, Nouv. Diet. Hist. Nat., vol. 20, 1818, p. 563. 

 (Paraguay.) 



On September 24, 1920, near an alkaline stream known as the 

 Riacho Salado in the Chaco, 170 kilometers west of Puerto Pinasco, 

 Paraguay, I saw one of these kites in a savanna dotted with low 



