^1920^] BANGS AND PENARD — TWO AMERICAN HAWKS 47 



Specimens examined. 

 Elanus leucurus leucurus, fourteen. — Argentina: Buenos Aires, 1. 



Chile: Santiago, 2; Chile,' 1. Uruguay: Concepcion del Uruguay, 



2. Paraguay (Lafr. coll. 414, d'Orbigny), 1. Brazil : Pernambuco, 2. 



Venezuela: El Trompillo, 2; Merida, 1; Venezuela,' 2. 

 Elanus leucurus majusculus, twenty-five. — Cahfornia: San Rafael 



(typelocaUty), 1; Nicasio, 1; Palo Alto, 1; Holden, 1; California,' 2. 



Florida: Osceola Co., 2; Florida,' 1. Texas: Corpus Christi, 2; 



Santa Maria, 1; Brownsville, 4; Cameron Co., 1; Texas,' 1. 



Mexico: Altamira, 2; Mirador (near Vera Cruz), 1; Orizaba, 2; 



Mexico,' 1. British Honduras: Toledo District, 1. 

 Measurements. 

 E. I. leucurus, fourteen males and females: wing, 300.8 (290-310); 



tail, 162.1 (149-177); tarsus, 35.0 (33-37); culmen from cere, 17.7 



(16.5-19.5) mm. 

 E. I. majusculus, twenty-five males and females: wing, 315.9 (300- 



325); taO, 178.8 (170-188); tarsus, 36.2 (32.0-40.5); culmen from 



cere, 19.2 (16.5-21.0) mm. 



The smallest individuals in the series examined are from the 

 southernmost portions of the range of the species — Concepcion 

 del Uruguay, Buenos Aires, and Pernambuco. 



The small southern form ranges from Argentina and Chile, 

 northward to Venezuela; the large northern form from Cali- 

 fornia, Texas, Oklahoma, South Carohna, and Florida, south- 

 ward through Mexico to British Honduras and Guatemala. 



There is thus a wide area in southern Central America and 

 northern South America between the ranges of the two forms 

 as outlined above, where the species apparently does not occur 

 at all. 



We suspect that there may be some constant difference in 

 size between the sexes, although the measurements of our 

 specimens do not indicate it. We cannot, however, rely abso- 

 lutely upon the determinations of sex appearing on the labels, 

 and so we are forced to list the specimens regardless of sex. 



' The exact locality of these specimena is not stated on the labels. 



