212 BIRDS OF THE REPUBLIC OF PANAMA — PART 2 



that she was covering 2 eggs. The following noon, when I returned to 

 take some photographs the male was incubating. 



The race gilvas ranges to the south through Colombia, except in the 

 southeastern llanos in the region of Caqueta, and is found in Vene- 

 zuela north of the Amazonian drainage of southern Amazonas. The 

 region to the south of these limits is inhabited by the typical race, 

 N. a. albicollis. From this gilvus differs in paler color, especially on 

 the sides of the head. 



In Panama it is interesting to observe that while N. a. gilvus is 

 found on the larger islands of the Perlas group in the Gulf of Panama, 

 and on the islands of Gobernadora and Cebaco at the mouth of Golfo 

 de Montijo, it does not reach Isla Coiba. 



NYCTIDROMUS ALBICOLLIS INTERCEDENS Griscom 



Nyctidromns albicollis intcrcedens Griscom, Amer. Mus. Nov., no. 370, October 

 17, 1929, p. 8. (Tela, Honduras.) 



Somewhat darker and more heavily pigmented than A r . a. gilvus. 



Measurements. — Males (14 from Honduras, Nicaragua, Costa Rica, 

 and Panama), 150-158 (153.8), tail 131-152 (140), tarsus 24.2-26.8 

 (25.6) mm. 



Females (10 from Guatemala, Honduras, Costa Rica, and Pan- 

 ama), wing 150-158 (153.5), tail 127-143 (133.3), tarsus 24.0-25.6 

 (25.0) mm. 



Resident. Common in western Bocas del Toro (Sibube, Changui- 

 nola, Rio Changuena, Almirante). 



Birds from the localities listed agree with the race intercedens of the 

 southern area of Central America, from Guatemala through Costa 

 Rica, in slightly darker average color. It is probable that the range 

 of the race in Bocas del Toro does not extend east of the Chiriqui 

 Lagoon. 



A single egg, received from Dr. Pedro Galindo, collected at Almi- 

 rante, Bocas del Toro, April 17, 1962, is long elliptical, smooth, with 

 faint gloss, in color pale pinkish buff, marked obscurely with irregular 

 spots of pinkish cinnamon and vinaceous-buff, and more faintly with 

 varying shades of purplish gray. It measures 29.9x21.9 mm. A sec- 

 ond egg, also from Dr. Galindo with the same locality data, dated 

 June 2, 1962, is subelliptical, colored like the first, but with the mark- 

 ings somewhat more definite, and distributed more uniformly over the 

 entire surface. It measures 29.4 X 21 .3 mm. 



