Vo, l™ V ] General Notes. 237 



Vermivora luciae. Lucy's Warbler. The fact that the first record 

 for this bird in Colorado was also found breeding, makes it seem possible 

 that the species has been overlooked by other collectors. Two specimens 

 (C. M. N. H. Nos. 3384 and 3385) together with their nest and eggs, were 

 collected at ' Four-corners' in Montezuma County on May 3, 1913. 



Hylocichla mustelina. Wood Thrush. The first record specimen 

 of the Wood Thrush was taken near Holly, Prowers County, on May 12, , 

 1913 (C. M. N. H. No. 2629). It seems not unlikely, however, that the 

 bird is extending its range westward. Confirmatory evidence for this 

 belief is afforded by two additional specimens collected on Dry Willow 

 Creek, Yuma County, on June 24, 1915. — F. C. Lincoln, Denver, Colo. 



Subsequent Nestings. — I was much interested in reading of Mr. 

 J. K. Jensen's experience (Auk, January, 1918, pp. 83-84) with the White- 

 rump ed Shrike (Lanius ludovicianus excubitorides) at Wahpeton, North 

 Dakota, in*1917, as they are very similar to mine at Hatley, Quebec, in 

 the same year with the Migrant Shrike (Lanius ludovicianus migrans) an 

 account of which it had been proposed to add as a postscript to my "A 

 Study of Subsequent Nestings after the Loss of the First," Auk, Vol. 

 XXXIV, 1917, pp. 381-393, but which had to be omitted at the last 

 moment owing to unforeseen circumstances. My pair of birds laid four 

 sets of eggs in succession, the first set being taken on May 30, and the last 

 on July 4, thus again giving practically eleven days interval between each 

 set. The first two consisted of six eggs each, the third of five, and the 

 fourth of four, the first nest being in an apple tree twelve feet up, the 

 second in a fir eighteen feet up, and seventy-one yards from the first, the 

 third in the same apple tree as the first only seventeen feet up, whilst the 

 fourth and last was again in an apple tree twelve feet up, and eighty-three 

 yards from the fir tree, the site of the second, and one hundred and fifty- 

 four yards from the apple tree, the site of the first nest. Now the most 

 interesting fact to me was the pigment in these eggs, for whereas with each 

 successive set the size, beauty and construction of the nests fell off, as well 

 as the number of the eggs, the pigment or coloring increased if anything, 

 the last set being equally or more highly pigmented than any of the others. 

 At a Meeting of the Nuttall Ornithological Club held at Cambridge on 

 November 19, 1917, at which I was present, I mentioned the above case. 

 It was suggested by one of the members present (I believe it was Mr. 

 Bangs) that the apparent higher coloring of this last set might be due to 

 an increased thinness of the inner membrane or lining of the shell, or to 

 the thinness of the shell itself, or both. The latter (thickness of shell) I 

 have examined with a microscope through the blow hole as well as I was 

 able, but can detect no apparent difference, but this is no easy matter to 

 decide off hand, and will require much more careful consideration. It 

 seems to me that we have here an interesting field for further investigation, 

 as there really does not appear to be much known or at all events published 

 on the causes and effects governing the pigment of eggs. The English 



