FAMILY TYRANNIDAE 



545 



(50.1). tail 36.0-41.4 (38.1), culmen from base 9.4-11.0 (10.2, 

 average of 9), tarsus 15.8-16.5 (16.1) mm. 



Resident. Found locally along swift mountain streams in the high- 

 lands of western Chiriqui and adjacent Bocas del Toro ; in Chiriqui 

 from 1200 to 2000 meters (above Cerro Punta) ; recorded in eastern 

 Bocas del Toro at Guaval on the upper Rio Calovevora, near the 

 boundary with Veraguas. 



The place of collection for a male in the British Museum (Natural 

 History) taken by Arce, marked "Santa Fe" (see Salvin, Proc. Zool. 



Figure 46. — Torrent tyrannulet, moscareta de torrentes, Serpophaga cinerea 



grisea. 



Soc. London, 1867, p. 145) is in error as it is the only record for the 

 Pacific lowlands of Veraguas. Localities in these early collections 

 were sometimes confused, so that it seems probable that the record 

 refers to Calovevora, where Arce recorded other species known 

 from the Caribbean slope. 



In personal observations I have found this species especially in 

 Chiriqui, along the Rio Chiriqui Viejo, from west of El Volcan to 

 above Cerro Punta, and on a western tributary of the river, the Rio 

 Colorado, at a road crossing on the highway toward Costa Rica. 



The birds usually are encountered in pairs along swift-running 



