226 BIRDS OF THE REPUBLIC OF PANAMA PART 2 



in caves, or under the shelter of rocks, and lays two eggs." Another 

 set of 2 received in the Crowley bequest is labeled only "New Gra- 

 nada," which in this instance should be Colombia. These 2 are dull 

 white, without gloss ; in form 1 is long elliptical, the other long oval. 

 They measure 32.5 x 21.6 and 32.0x22.5 mm. 



In Oaxaca and Chiapas J. Stuart Rowley and Robert T. Orr (Con- 

 dor, 1965, pp. 449-456) found the allied subspecies, Streptoprocne z. 

 mexicana nesting in caves behind waterfalls where the air was satu- 

 rated with moisture. Nests, placed on ledges, were "composed of 

 mud, moss, and large quantities of insect chitin rather evenly dis- 

 tributed through the nest structure." A shallow depression in the top 



Figure 36. — Head of white-collared swift, vencejo cuelliblanco, Streptoprocne 

 zonaris albicincta. 



held the eggs, 2 in number in the complete set. The white eggs "were 

 very soiled by wet mud." They give measurements of 33x22 mm. 

 for 1 egg taken from the oviduct of a female collected for a specimen. 

 In another account Rowley (Proc. West. Found. Vert. Zool., vol. 1, 

 no. 3, 1966, p. 126) gives the range of size in eggs as 33.7-39.5 x22.2- 

 23.4 mm. 



CHAETURA CHAPMANI CHAPMANI Hellmayr: 

 Chapman's Swift, Vencejo de Chapman 



Chaetura chapmani Hellmayr, Bull. Brit. Orn. Club, vol. 19, March 30, 1907, 

 p. 62. (Caparo, Trinidad.) 



Crown, back and wings black ; rump and upper tail coverts grayish 

 brown ; throat only slightly lighter than breast. 



Description. — Length 115-125 mm. Adult (sexes alike), lores deep 

 black; crown, hindneck, and back dull black; wings black glossed 

 lightly with steel blue; outer webs of short, innermost secondaries, 



