I did not meet with it to the north of the Guadarrama 

 range, but know that it occurs sparingly in the neigh- 

 bourhood of San Ildefonso in Old Castile. 



In general habits this bird appeared to us to resemble 

 the Common Nightjar, but there is a very perceptible 

 difference between the " churring " notes of the two 

 species ; their eggs are not to be distinguished by any 

 constant diversity of size or markings. 



