326 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



currence and appeared to gather in little scattered colonies, as many 

 extensive areas of suitable growth were not inhabited by them. 

 They were sh}'^ and apprehensive, so that it was often difficult to 

 approach them. Their custom was to clamber about among the rush 

 stalks, where their long legs fitted them for progress, or occasionally 

 to fly across little openings with slightly tilting, but direct flight, 

 performed with head erect and rapidly flitting wings. The white 

 in wing and tail are prominent in flight. Occasionally they de- 

 scended to run about on little mud bars at the bases of clumps of 

 cat-tails. 



They were first recorded at Dolores, Buenos Aires, on October 

 21, 1920, when two were seen. Near Lavalle, in the same Province, 

 they were found casually on October 30, November 2 and 9, but were 

 not common. On March 26, and 28, 1921, a number were recorded 

 near Tunuyan, Mendoza, in the rush-grown marshes known as 

 cienagas. They were found here in little family parties, and, though 

 shy, were tolled out by squeaking from concealment among the cat- 

 tails. Near Concon, Chile, April 28, one was seen, and on the day 

 following one was brought by a boy as, in company with Dr. 

 E. P. Keed, I was about to leave for Valparaiso. 



LEPTOPOGON AMAUROCEPHALUS Cabanis 



Leptopogon amaurocephalus Cabanis, Arch. Naturg., vol. 1, 1847, p. 251. 

 (Brazil.) 



On July 21, 1920, at Las Palmas, Chaco, an adult female Lepto- 

 fogon was killed in dense brush near the Rio Quia. The bird 

 hopped about actively under cover of the branches, or paused to 

 rest for considerable intervals on hidden perches. In this specimen, 

 when first taken, the extreme base of the mandible was tilleul buif ; 

 rest of bill black; iris natal brown; tarsus and toes fuscous. 



With only three specimens of L. amaurocephalus at hand, I do 

 not care to express an opinion as to the forms into which this 

 species may be divided. The specimen from Las Palmas, which 

 has the wing 65.2 mm. long, is slightly deeper and richer in color 

 throughout than a skin from Victorica, Sao Paulo, or the type of 

 icastus Oberholser ^^ from Sapucay, Paraguay. Chubb " has in- 

 dicated that specimens from Sapucay do not differ from others from 

 Brazil. 



CAMPTOSTOMA OBSOLETUM OBSOLETUM (Temminck) 



Muscwapa ohsoleta Temminck, Nouv. Roc. Planch. Col. Oiseaux, vol. 3,. 

 1838, pi. 275, fig. 1. (Curytiba, Parana, Brazil.") 



Five males, one shot at Eesistencia, Chaco, July 8, 1920, one from 

 Laguna Wall, 200 kilometers west of Puerto Pinasco, Paraguay, 



i-Proc. Biol. Soc. Washington, vol. 14, Dec. 12, 1901, p. 187. 



'"Ibis, 1910, p. 582. 



i» Nov. Zool., vol. 15, June, 1908, p. 43. 



