I06 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



two males and a female February 15 and 20, 1960. These are the 

 specimen records that have been reported to the present. 



In my own few encounters with the species in life on Cerro 

 Pando I have noted it as similar in general to the related Plain Xenops, 

 but easily recognized from the clear white throat and heavily streaked 

 under surface. The female collected in 1960 was one of a pair 

 that climbed actively over the lower section of a large stub standing 

 in dense undergrowth. Occasionally they shifted to large swinging 

 vines. The call, heard briefly, was a sharp metallic chipping note. 



This race is found in the highlands of central and southern Costa 

 Rica, in addition to western Chiriqui. 



XENOPS RUTILANS INCOMPTUS Wetmore 



Xenops rutilans incomptus Wetmore, Proc. Biol. Soc. Washington, vol. 82, no. 

 59, Feb. 5, 1970, p. 772. (Cana, Cerro Pirre, Darien, Panama.) 



Characters. — Small, with bill smaller ; pale streaks above and 

 below reduced, decidedly narrower ; less huffy wash on lower abdomen 

 and flanks ; rump and upper tail coverts slightly darker. 



Measurements. — Male (type, from Cerro Pirre, Darien), wing 

 62.0, tail 41.2, culmen from base 12.9, tarsus 14.7 mm. 



Female (1 from Cerro Pirre, Darien), wing 62.7, tail 41.9, culmen 

 from base 13.0, tarsus 15.0 mm. 



Resident. Rare ; Cerro Pirre, Darien. 



This form is known to date from the two specimens (listed in the 

 measurements above), collected at Cana, on Cerro Pirre, Darien, by 

 R. R. Benson, the female on April 20 and the male on July 31, 1928. 

 Griscom (Bull. Mus. Comp. Zool, vol. 69, 1929, pp. 171-172) 

 recognized that these two differed in size, but with the few specimens 

 then available for comparison, listed them tentatively imder the sub- 

 specific name hctcrurus Cabanis and Heine, the form of adjacent 

 Colombia. With the series of the Colombian form collected by M. A. 

 Carriker, Jr., now available, and additional specimens of septen- 

 trionalis from Chiriqui and Costa Rica, it is obvious that the birds 

 from Cana are without question a distinct race. It seems probable 

 that this may range also in the Serrania del Darien. 



Measurements of the race septcntrionalis of Chiriqui and Costa 

 Rica are given above. Those of heteriiriis, from the series collected 

 in Colombia by Carriker, are as follows : 



Males (7 from the departments of Antioquia, Cauca, and Huila), 

 wing 70.7-74.0 (72.1), tail 46.1-52.4 (49.9), culmen from base 

 13.0-13.7 (13.3), tarsus 14.3-15.2 (14.9) mm. 



