iSS6.] 



Mearns 071 the Birds of Arizona. 



291 



gated, graduated tail of somewhat decurved rectrices, and short, 

 rounded wings ; but the discrepancy in the relative size and form 

 of the bill and extremities, is considerable. However, a glance 

 at the accoiTipan3'ing table of comparative dimensions and ratios, 

 will show that these four species form a continuous series in the 

 order named. In H. crissalis and H. lecontei., the elongation 

 of the bill and tail is coincident with the abbreviation of the wings 

 and legs; and the arcuation and slenderness of the bill is exactly 

 correlated to its attenuation, H. crissalis having the longest, 

 slenderest and most arcuate bill, while H. bendirei has the short- 

 est, stoutest and straightest. 



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