152 



179. [675) Seiuras noreboraci'itsi-'^ {Gmel. ). Water-Thrush. 



Common migrant. March 27 to May 5. September 14 to 18. ^^oiu 

 April 12. 1003. 



MIGRATION RECCED. 



180. [675a] Sn'nnt.s noreboracemii^ iiota}>ilix (Ridgw. ). Grinnell's Water- 



Tlmisli. 



Rare migrant. A specimen taken April 2:t. IsstJ, by G. G. Williamson 

 is referred to this form. Probably Grinnell's Water-Thrush will be found 

 to be as numerous as the last when more specimens are obtained for 

 exact identification. The differences are rather slight and more relative 

 than absolute, and as the birds seem to vary considerably, it is no 

 wonder that there has been no distinction made V»etweeu the two forms 

 in the migration records. 



A specimen of this Water-Thrush taken at Indianapolis. May 14, 

 1875 (D. S. Jordan!, shows a variation in a generic character. All parts of 

 definitions of the genus SeitirKS and of keys referring to the tail 

 feathers are substantially as the following from Ridgway flD02): "Inner 

 webs of lateral rectrices without white terminal spot." The individual 

 under consideration has distinctly marked, white, terminal spots on the 

 first and second outer rectrices of the right side, and slight indications 

 of spots on the two opposite, outermost tail feathers. 



181. [676] S('ii(rii!< motacilla (Yieill.). Louisiana Water-Thruslu 

 Rather common summer resident. March to September 1. 



Song April 12, 1903. May 10, 1903, nest and six eggs, among rocks 

 and roots al)ove the mouth of a cave (C. G. L.). June 3, 1901. nest of 

 leaves, grass-lined, under an overhanging ledge (at the same place). It 

 contained six young (W. L. H.i. 



All the tangled ravines and cascaded cave outlets ring with the 

 striking song of the Louisiana Water-Thrush in April and onrly May. 



