224 BIRDS OF THE REPUBLIC OF PANAMA PART 2 



Upper tail coverts uniform with rump, both lighter colored than crown and 

 back 7 



7. Definitely black on breast ; throat sooty brown ; tail shorter, not more than 



32 mm Short-tailed swift; Chaetura brachyura brachyura, p. 239 



Breast grayish brown to dark grayish brown; throat paler; tail 34 mm. 

 or more 8 



8. Rump and upper tail coverts distinctly gray. 



Gray-rumped swift, Chaetura cinerciventris phaeopygos, p. 234 

 Rump and upper tail coverts grayish brown 9 



9. Upper surface, except rump, black; throat only slightly paler than breast. 



Chapman's swift, Chaetura c. chapmani, p. 226 

 Upper surface, except rump, brownish black ; throat definitely paler than 



breast 10 



10. Larger, wing more than 125 mm. ; under tail coverts paler than breast. 



Andre's swift, Chaetura andrei meridionalis, p. 238 

 Smaller, wing less than 115 mm.; under tail coverts not paler than breast. 



Vaux's swift, Chaetura vauxi, p. 229 



STREPTOPROCNE ZONARIS ALBICINCTA (Cabanis) : 

 White-collared Swift, Vencejo Cuelliblanco 



Figure 36 



Hemiprocne albicincta Cabanis, Journ. f. Orn., vol. 10, May 1862, p. 165. (Junc- 

 tion of Haiama Creek and the Demerara River, Guyana.) 



Largest of the swifts found in the Republic; black, with white 

 collar. 



Description. — Length 185-205 mm. Adult (sexes alike), throat, 

 f oreneck, wings, and tail sooty black ; crown, back to upper tail coverts, 

 breast and sides deeper black ; a collar, broader on the foreneck, 

 white. 



Immature, feathers of lower foreneck and upper breast edged very 

 faintly with dull white ; white collar present on hindneck, but much 

 reduced or absent across lower foreneck. 



Iris dark brown ; bill black ; tarsus and toes slaty black ; claws 

 fuscous. 



Measurements. — Males (10 from Panama and Colombia), wing 

 195-202 (198.0), tail 64.3-74.2 (67.8), culmen from base 11.0-12.6 

 (11.8), tarsus 21.8-23.7 (22.8) mm. 



Females (6 from Guatemala, Panama, Colombia, and Venezuela), 

 wing 193-205 (198.1), tail 62.3-73.0 (66.7), culmen from base 11.0- 

 12.0 (11.4), tarsus 21.5-23.3 (22.2) mm. 



Weight <$ 60, $ 74 grams (Trinidad, Snow and Snow, Zoologica, 

 vol. 48, 1963, p. 7) ; sex?, 92.5-100.5 grams, Venezuela (recorded by 

 Charles T. Collins). 



