Vol. XII 



1S95 



Mf.rriam, The LeConte Thrasher. 



57 



determine. But as a rule resident birds are less regular than 

 migrants in the time of breeding, and in warm climates where the 

 season is long the irregularity is likely to be greater than in cool 

 climates where the season is short. 



Changes ix the Form ok the Bill with Age in Harporhynchus. 



Iccojifei. 



The nest is a compact and rather bulky structure composed 

 mainly of small twigs and not covered above. Though some- 

 times in a mesquite or other thorny bush, it is placed by prefer- 



