FAMILY FORMICARIIDAE 163 



117, 1952, p. 34), and others reported on the Pipeline Road near 

 Gamboa and near Achiote. Griscom's type specimen, a male, was 

 collected by Thomas Barbour and W. S. Brooks at Jesucito, Darien, 

 on the Rio Jesucito, a small stream east of the base of Cerro Sapo. 

 He mentioned also a female from El Tigre, on the Rio Cupe, taken 

 by Benson. One in the Philadelphia Academy was taken at Garachine 

 in 1941. E. A. Goldman collected two females at Cana on Cerro 

 Pirre, February 28, 1912. 



I saw this interesting species first at Jaque, Darien, on March 19, 

 1946, when I found one moving actively through the lower branches 

 in gallery forest. It was encountered next in dark, swampy woods 

 near the sea at Mandinga, western San Bias, on January 26, 1957, 

 a single bird seen indistinctly as it fluttered among twigs in the higher 

 branches. Later, in work in the great valley of the Tuira and 

 Chucunaque, locally they were fairly common. In March 1959, they 

 were in pairs that moved about rather freely through the smaller trees 

 in forest growth along streams, without the nervous regard for hiding 

 behind cover found in their larger relatives. Their small size seemed 

 protective as any leaf served to hide them. They were found again 

 near Pucro on the Rio Pucro on February 3, 1964. 



The song is a repetition of a single note that increases in rapidity 

 of utterance to end in a trill, tree-tree-tree-tree-ee-ee-ee. In voice 

 and mannerism they suggest a miniature of Myrmotherula suri- 

 namensis. 



I have found no report of their nesting. 



MYRMOTHERULA SURINAMENSIS PACIFICA Hellmayr: 

 Streaked Ant-wren, Hormiguerito Rayado 



Figure 15 



Myrmotherula siirinamensis pacifica Hellmayr, Proc. Zool. Soc. London, De- 

 cember 5, 1911, p. 1159. (Buenaventura, Valle, Colombia.) 



Small ; male, black above, streaked with white ; white below streaked 

 with black. Female, crown rufous streaked with black, otherwise 

 like male on upper surface ; under surface white, washed with buff. 



Description. — Length 88-98 mm. Rectrices 12. Adult male, upper 

 surface, crown to back, including scapulars, black streaked narrowly 

 with white ; wings black ; middle and greater coverts tipped with 

 white ; outer margins of primaries with margins of inner secondaries 

 edged with white ; tail black, tipped narrowly and edged basally with 

 white ; rump feathers and upper tail coverts long and lax, gray, the 

 tail coverts tipped indistinctly with white ; a concealed white area 

 in center of back; side of head and under surface white, with throat. 



