342 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



their wings in an endeavor to entice females to examine the proposed 

 nest site or circled about near by. Their broken, warbling song Avas 

 heard continually. Though apparently mating, the two taken were 

 not yet in breeding condition, and two nest holes that I examined 

 September 9 were empty. The species was recorded west to Kilome- 

 ter 110. The white rump is a field mark prominent in flight. At 

 San Vicente, Uruguay, from January 27 to February 3, families of 

 young recently from the nest were recorded, while near Lazcano, 

 Uruguay, from February 3 to 9, the birds had gathered in flocks 

 which contained from 10 to 100 individuals that rested on fence 

 wires or circled low over the fields. The birds were so abundant 

 here that hundreds frequently were observed during a day. 



HIRUNDO ERYTHROGASTRA Boddaert 



Hlrundo erpthrogaster Boddaekt, Tabl. Planch. Enl., 1783, p. 45. 

 (Cayenne.) 



On the evening of September 24, 1920, when near the Laguna 

 Wall, in the Chaco, 200 kilometers w^est of Puerto Pinasco, Para- 

 guay, I was delighted to distinguish the graceful forms of several 

 barn swallows among the members of a flock of Pygochelidon that 

 came circling over the marshes in search of a secure resort to spend 

 the night. The L ngua Indian who was with me distinguished the 

 specimen that I collected, an adult female, from other swallows as 

 Tneni a sakh sa heht Ml wa nah. In the southern part of their win- 

 ter range, barn swallows were not common as subsequently I saw 

 them on only three occasions, at Puerto Pinasco, near the Rio 

 Paraguay, September 30; near Lezama, Buenos Aires (from a 

 train), October 19, and near Lavalle, Buenos Aires, November 15. 

 Two were seen on each of these dates. 



ALOPOCHELIDON FUCATA (Temminck) 



Hirundo fucata Temminck, Nouv. Rec. Planch. Col. Ois., vol. 4, 1838, pi. 

 161. (Brazil.) 



This species was observed on August 23 and 24 near my hotel in 

 Formosa, Formosa, under such conditions that it could not be col- 

 lected. On one occasion a pair alighted on the ground to waddle 

 about with sidling steps, picking up bits of sand. A female shot 

 March 28, 1921, from a flock of Pygochelidon. at Tunuyan, Mendoza, 

 was the only one taken. On the wing this bird resembles a rough- 

 wanged swalloAv {Stelgidopteryx) . 



Chubb ^^ has described a subspecies of this bird from Mount 

 Roraima, British Guiana, as A. f. roraiTnae^ on the basis of brighter 

 coloration of head and throat, paler dorsal surface, and smaller size 



saBuU. Brit. Orn. Club, vol. 40, .Tune 30, 1920, p. 155. 



