FAMILY PARULIDAE 



265 



Griscom (Bull. Mus. Comp. Zool., vol. 78, 1935, p. 367) recorded the 

 subspecies sonorana from Veraguas and the Canal Zone but there are 

 no specimens from Panama identified as sonorana in either the Mu- 

 seum of Comparative Zoology {fide R. A. Paynter, Jr.) or the Ameri- 

 can Museum of Natural History {fide W. E. Lanyon). Nor are there 

 any specimens of this subspecies in the extensive Smithsonian holdings 

 of migrant D. petechia from Panama. D. a. sonorana breeds in the 

 southwestern United States and northern Mexico and reputedly win- 

 ters as far south as Colombia and Ecuador, so it might be expected to 

 occur in Panama. This remains to be confirmed, however. 



DENDROICA PETECHIA AEQUATORIALIS Sundevall 



Dendroica petechia aequatorialis Sundevall, 1870, Ofv. K. Sv. Vet.-Akad. Forh., 

 26 (1869), p. 609. (Panama City.) 



Characters. — Male with crown, cheeks, and throat uniform brown, 

 but of a lighter shade than in aithocorys, upper breast streaked with 

 yellow. 



A male collected at Chico, Province of Panama, on March 24, 1961, 

 had the iris wood brown; maxilla fuscous; base of mandibular rami 

 across base of gonys dull buffy brown, rest of mandible dull neutral 

 gray; tarsus and toes dull honey yellow; claws mouse brown. 



Measurements. — -Males (10 from Province of Panama), wing 59.8- 

 63.5 (62.5), tail 43.6-48.8 (47.1), culmen from base 11.1-13.0 (12.0), 

 tarsus 17.3-18.8 (18.2) mm. 



Females (10 from Province of Panama), wing 58.5-62.5 (59.6), 

 tail 39.3-49.3 (45.6), culmen from base 11.5-13.3 (12.2), tarsus 17.1- 

 18.7 (17.9) mm. 



Resident. Common but somewhat local on the Pacific Coast of the 

 Province of Panama and on the Pearl Islands. On the mainland it is 

 usually found in mangroves, but occasionally in other vegetation ad- 

 jacent to salt water. They are, for example, widespread on the forti- 

 fied islands of Ft. Amador, in scrub and low dry woods. In 1944, how- 

 ever, on San Jose and Pedro Gonzalez islands in the Pearl Archipelago, 

 I found that Yellow Warblers were distributed widely through the 

 higher forest growths. This is probably due to the absence of compet- 

 ing small insectivores such as are found on the mainland. On San Jose 

 I recorded them away from the shore, mainly in the taller trees near or 

 over water, but on Pedro Gonzalez they were common over the forested 

 hills far from any such habitat. Because of the heavy vegetation they 

 were more evident along the shores, as elsewhere they remained con- 



