392 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



Panama Bay, Canal Zone; and Isla Pacheca, Archipielago de las 

 Perlas. 



Two specimens in the American Museum of Natural History were 

 collected on Isla Pacheca by Griscom and Crosby on March 9, 1927. 

 One. marked female, has the wing 89.0 and the tail 63.3 mm, thus 

 agreeing definitely with the northern race. The second, with sex 

 marked "male" (wing 87.1, tail 59.0 mm), probably also is a female, 

 as it agrees in size with that sex. These two are the only records 

 of the species in the Archipielago de las Perlas, an indication that 

 they were in migration. A third, a male, in the collection of the 

 Cornell Laboratory of Ornithology, was collected by R. B. Lea, 

 March 11, 1946, on board the U.S.S. Grafton, when the ship was 

 anchored in Panama Bay off the Canal Zone. 



MYIODYNASTES LUTEIVENTRIS Sclater: Sulphur-bellied 

 Flycatcher, Papamoscas Cejiblanco 



Medium size ; like the Streaked Flycatcher, Myiodynastes niacii- 

 latus, but yellowish on lower surface, with a heavy black line on either 

 side of the throat, the two joined across the chin. 



Description. — Length 180-205 mm. Adult (sexes alike), forehead 

 and superciliary grayish white ; rest of crown and hindneck brownish 

 gray to olive, streaked narrowly with black ; center of crown with a 

 concealed patch of yellow ; back, scapulars, and upper rump light 

 olive, the feathers edged with buff, the two colors forming light and 

 dark streaks ; lower rump and upper tail coverts cinnamon-rufous, 

 streaked with dusky ; tail cinnamon-rufous, with a shaft line of dusky 

 that is expanded distally ; wings dusky ; outer webs of middle and 

 greater coverts and the secondaries edged with white to yellowish 

 white; lesser coverts edged narrowly with grayish buff; lores and 

 auriculars dusky ; malar area and space below eye dull white to 

 brownish or yellowish white; chin and sides of throat dusky-black 

 edged with grayish olive; rest of throat white streaked with dusky; 

 rest of under surface pale yellow to yellowish white; breast and 

 sides streaked with black and dusky ; axillars and under wing coverts 

 pale yellow with dusky shaft lines ; inner margin of primaries and 

 secondaries edged with white to pale yellow. 



A passage migrant fall and spring to and from wintering grounds 

 in South America, fairly common. The species as a whole, while 

 generally similar to the abundant resident Myiodynastes maculatus 

 difficilis, the Streaked Flycatcher, when clearly seen is easily dis- 



