FAMILY TYRANNIDAE 459 



tail 55.8, 60.0; culmen from base 13.5, 15.0; tarsus 11.5. 11.6 mm. 



Female (1 from the type locality), wing 80.6, tail 60.0, culmen 

 from base 14.1, tarsus 12.0 mm. 



Passage migrant from the north, probably to winter quarters in 

 northern South America ; abundance uncertain. 



This form, resident in the breeding season in Guerrero, south- 

 western Mexico, was named from a series from Chilpancingo and 

 Cuapongo. It was believed to winter in South America, though no 

 winter specimens were seen. 



In our series there are two males, collected as migrants in western 

 Chiriqui, both at an elevation of 1280 meters. The first, on March 17, 

 1954, was found on the Quebrada Santa Clara, midway between El 

 Volcan and the Costa Rican boundary. The second, taken March 17, 

 1965, at Palo Santo on the western side of the Rio Chiriqui Viejo, 

 to the west of El Volcan, was heavy with fat. Both had completed 

 the winter molt and are in fresh plumage. They are similar to two 

 males and a female from Chilpancingo, available on loan from the 

 original series in the California Academy of Sciences through the 

 kindness of Robert Orr and Lawrence Binford. Measurements of 

 these are listed above. The two migrants are like the three mentioned 

 in bill form and size, but are faintly brighter in color due to their 

 recent renewal of feathers. They measure as follows : Wing 84.0, 

 85.0; tail 59.2, 61.2; culmen from base 14.3, 15.0; tarsus in both 

 13.0 mm. 



Two others, in the American Museum of Natural History, col- 

 lected by E. S. Morton on Cerro Campana, Panama, August 13, 1970, 

 were sent by him to Eugene Eisenmann. who brought them to my 

 attention. Both are males in worn plumage but not yet in molt. They 

 have been identified as griscomi by Allan Phillips, in which I agree, 

 from comparison with the other specimens available. They measure 

 as follows: wing 84.0, 85.0; tail 55.8, 60.0; culmen from base 13.5, 

 15.1 ; tarsus 11.5, 11.6 mm. 



Apparently this form may pass regularly through the mountain 

 areas of the Republic. It may be identified only from specimens in 

 hand. 



CONTOPUS CINEREUS (Spix) : Tropical Pewee, Papamoscas 



Tropical 



Platyrhynchus cinereus Spix, Av. Bras. vol. 2, p. 11, pi. 13, fig. 2, 1825. 

 (Rio de Janeiro, Brazil.) 



A small, slender pewee with relatively long tail ; crown cap darker 

 than back ; lores indistinctly grayish white. 



